[PATCH] remove unlikely(sb) in prune_dcache

likely profiling shows that the following is a miss.

After boot:
[+- ] Type | # True | # False | Function:Filename@Line
+unlikely |     1074|        0  prune_dcache()@:fs/dcache.c@409

After a bonnie++ run:
+unlikely |    66716|    19584  prune_dcache()@:fs/dcache.c@409

So remove it.
Signed-off-by: NHua Zhong <hzhong@gmail.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/dcache.c

@@ -406,7 +406,7 @@ static void prune_dcache(int count, struct super_block *sb)
 		cond_resched_lock(&dcache_lock);
 
 		tmp = dentry_unused.prev;
-		if (unlikely(sb)) {
+		if (sb) {
 			/* Try to find a dentry for this sb, but don't try
 			 * too hard, if they aren't near the tail they will
 			 * be moved down again soon