cxgb4: properly initialize variables

memset variables to 0 to fix sparse warnings:

drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c:409:42: sparse: Using
plain integer as NULL pointer

drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c:43:47: sparse: Using
plain integer as NULL pointer

Fixes: ad75b7d32f25 ("cxgb4: implement ethtool dump data operations")
Fixes: 91c1953de387 ("cxgb4: use zlib deflate to compress firmware dump")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c

@@ -40,8 +40,8 @@ int cudbg_compress_buff(struct cudbg_init *pdbg_init,
 			struct cudbg_buffer *pin_buff,
 			struct cudbg_buffer *pout_buff)
 {
-	struct z_stream_s compress_stream = { 0 };
 	struct cudbg_buffer temp_buff = { 0 };
+	struct z_stream_s compress_stream;
 	struct cudbg_compress_hdr *c_hdr;
 	int rc;
 
@@ -53,6 +53,7 @@ int cudbg_compress_buff(struct cudbg_init *pdbg_init,
 	c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
 	c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
 
+	memset(&compress_stream, 0, sizeof(struct z_stream_s));
 	compress_stream.workspace = pdbg_init->workspace;
 	rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
 			       Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,

drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c

@@ -406,14 +406,15 @@ static void cudbg_free_compress_buff(struct cudbg_init *pdbg_init)
 int cxgb4_cudbg_collect(struct adapter *adap, void *buf, u32 *buf_size,
 			u32 flag)
 {
-	struct cudbg_init cudbg_init = { 0 };
 	struct cudbg_buffer dbg_buff = { 0 };
 	u32 size, min_size, total_size = 0;
+	struct cudbg_init cudbg_init;
 	struct cudbg_hdr *cudbg_hdr;
 	int rc;
 
 	size = *buf_size;
 
+	memset(&cudbg_init, 0, sizeof(struct cudbg_init));
 	cudbg_init.adap = adap;
 	cudbg_init.outbuf = buf;
 	cudbg_init.outbuf_size = size;