Fix mutex_trylock() copy-and-paste bug (x86, x86-64, generic mutex-dec.h)

Noticed by Arjan originally on x86-64, then Ingo on x86, and finally me
grepping for it in the generic version.

Bad parenthesis nesting.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/asm-i386/mutex.h b/include/asm-i386/mutex.h
index c657d4b..9b2199e 100644
--- a/include/asm-i386/mutex.h
+++ b/include/asm-i386/mutex.h
@@ -125,7 +125,7 @@
 	 * the mutex state would be.
 	 */
 #ifdef __HAVE_ARCH_CMPXCHG
-	if (likely(atomic_cmpxchg(count, 1, 0)) == 1)
+	if (likely(atomic_cmpxchg(count, 1, 0) == 1))
 		return 1;
 	return 0;
 #else