mips: undo locking on error path returns

[akpm@linux-foundation.org: coding-style cleanups]
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mips/kernel/irixsig.c

@@ -430,6 +430,7 @@ asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 			break;
 
 		default:
+			spin_unlock_irq(&current->sighand->siglock);
 			return -EINVAL;
 		}
 		recalc_sigpending();