[PATCH] remove unused register from clobber list in down_trylock()

Remove "%d0" register from clobber list of down_trylock() for
m68knommu. It is not used by the asm code here at all.

include/asm-m68knommu/semaphore.h

@@ -145,7 +145,7 @@ extern inline int down_trylock(struct semaphore * sem)
 		".previous"
 		: "=d" (result)
 		: "a" (sem1)
-		: "%d0", "memory");
+		: "memory");
 	return result;
 }