sysfs: In sysfs_lookup don't open code sysfs_find_dirent

This is a small cleanup patch that makes the code just
a little bit cleaner.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/sysfs/dir.c

@@ -756,9 +756,7 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
 
 	mutex_lock(&sysfs_mutex);
 
-	for (sd = parent_sd->s_children; sd; sd = sd->s_sibling)
-		if (sysfs_type(sd) && !strcmp(sd->s_name, dentry->d_name.name))
-			break;
+	sd = sysfs_find_dirent(parent_sd, dentry->d_name.name);
 
 	/* no such entry */
 	if (!sd)