lib/zlib_inflate/inflate.c: remove fall through warnings

This patch remove all following fall through warnings by
adding /* fall through */ markers.
Note that we cannot add "__attribute__ ((fallthrough));" due to it is GCC7 only
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:384:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:391:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:393:16: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:430:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:556:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:595:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:602:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:627:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:646:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
arch/arm/boot/compressed/../../../../lib/zlib_inflate/inflate.c:696:25: warning: this statement may fall through [-Wimplicit-fallthrough=]

It is easy to see that thoses fall through are needed since in each case state->mode are set to the case value just below.

Link: http://lkml.kernel.org/r/1536215920-19955-1-git-send-email-clabbe@baylibre.com
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/zlib_inflate/inflate.c

@@ -382,6 +382,7 @@ int zlib_inflate(z_streamp strm, int flush)
             strm->adler = state->check = REVERSE(hold);
             INITBITS();
             state->mode = DICT;
+	    /* fall through */
         case DICT:
             if (state->havedict == 0) {
                 RESTORE();
@@ -389,8 +390,10 @@ int zlib_inflate(z_streamp strm, int flush)
             }
             strm->adler = state->check = zlib_adler32(0L, NULL, 0);
             state->mode = TYPE;
+	    /* fall through */
         case TYPE:
             if (flush == Z_BLOCK) goto inf_leave;
+	    /* fall through */
         case TYPEDO:
             if (state->last) {
                 BYTEBITS();
@@ -428,6 +431,7 @@ int zlib_inflate(z_streamp strm, int flush)
             state->length = (unsigned)hold & 0xffff;
             INITBITS();
             state->mode = COPY;
+	    /* fall through */
         case COPY:
             copy = state->length;
             if (copy) {
@@ -461,6 +465,7 @@ int zlib_inflate(z_streamp strm, int flush)
 #endif
             state->have = 0;
             state->mode = LENLENS;
+	    /* fall through */
         case LENLENS:
             while (state->have < state->ncode) {
                 NEEDBITS(3);
@@ -481,6 +486,7 @@ int zlib_inflate(z_streamp strm, int flush)
             }
             state->have = 0;
             state->mode = CODELENS;
+	    /* fall through */
         case CODELENS:
             while (state->have < state->nlen + state->ndist) {
                 for (;;) {
@@ -554,6 +560,7 @@ int zlib_inflate(z_streamp strm, int flush)
                 break;
             }
             state->mode = LEN;
+	    /* fall through */
         case LEN:
             if (have >= 6 && left >= 258) {
                 RESTORE();
@@ -593,6 +600,7 @@ int zlib_inflate(z_streamp strm, int flush)
             }
             state->extra = (unsigned)(this.op) & 15;
             state->mode = LENEXT;
+	    /* fall through */
         case LENEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -600,6 +608,7 @@ int zlib_inflate(z_streamp strm, int flush)
                 DROPBITS(state->extra);
             }
             state->mode = DIST;
+	    /* fall through */
         case DIST:
             for (;;) {
                 this = state->distcode[BITS(state->distbits)];
@@ -625,6 +634,7 @@ int zlib_inflate(z_streamp strm, int flush)
             state->offset = (unsigned)this.val;
             state->extra = (unsigned)(this.op) & 15;
             state->mode = DISTEXT;
+	    /* fall through */
         case DISTEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -644,6 +654,7 @@ int zlib_inflate(z_streamp strm, int flush)
                 break;
             }
             state->mode = MATCH;
+	    /* fall through */
         case MATCH:
             if (left == 0) goto inf_leave;
             copy = out - left;
@@ -694,6 +705,7 @@ int zlib_inflate(z_streamp strm, int flush)
                 INITBITS();
             }
             state->mode = DONE;
+	    /* fall through */
         case DONE:
             ret = Z_STREAM_END;
             goto inf_leave;