remove useless tolower in isofs

Remove useless tolower in isofs
Signed-off-by: dave young <hidave.darkstar@gmail.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/isofs/inode.c

@@ -197,7 +197,7 @@ isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 	hash = init_name_hash();
 	while (len--) {
 		c = tolower(*name++);
-		hash = partial_name_hash(tolower(c), hash);
+		hash = partial_name_hash(c, hash);
 	}
 	qstr->hash = end_name_hash(hash);