isdn/hisax: amd7930_fn: Remove unnecessary parentheses

Clang warns when multiple sets of parentheses are used for a single
conditional statement.

drivers/isdn/hisax/amd7930_fn.c:628:32: warning: equality comparison
with extraneous parentheses [-Wparentheses-equality]
                if ((cs->dc.amd7930.ph_state == 8)) {
                     ~~~~~~~~~~~~~~~~~~~~~~~~^~~~
drivers/isdn/hisax/amd7930_fn.c:628:32: note: remove extraneous
parentheses around the comparison to silence this warning
                if ((cs->dc.amd7930.ph_state == 8)) {
                    ~                        ^   ~
drivers/isdn/hisax/amd7930_fn.c:628:32: note: use '=' to turn this
equality comparison into an assignment
                if ((cs->dc.amd7930.ph_state == 8)) {
                                             ^~
                                             =
1 warning generated.

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/hisax/amd7930_fn.c

@@ -625,7 +625,7 @@ Amd7930_l1hw(struct PStack *st, int pr, void *arg)
 		break;
 	case (HW_RESET | REQUEST):
 		spin_lock_irqsave(&cs->lock, flags);
-		if ((cs->dc.amd7930.ph_state == 8)) {
+		if (cs->dc.amd7930.ph_state == 8) {
 			/* b-channels off, PH-AR cleared
 			 * change to F3 */
 			Amd7930_ph_command(cs, 0x20, "HW_RESET REQUEST"); //LMR1 bit 5