xtensa: remove unused variable wmask

After a cleanup the function show_regs doesn't use variable wmask but
still computes it. Drop it.

Fixes: 8d7e8240e6 ("[XTENSA] Clean up elf-gregset.")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/kernel/traps.c

@@ -464,12 +464,10 @@ void secondary_trap_init(void)
 
 void show_regs(struct pt_regs * regs)
 {
-	int i, wmask;
+	int i;
 
 	show_regs_print_info(KERN_DEFAULT);
 
-	wmask = regs->wmask & ~1;
-
 	for (i = 0; i < 16; i++) {
 		if ((i % 8) == 0)
 			pr_info("a%02d:", i);