vfs: live vfsmounts never have NULL ->mnt_sb

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 36b1d7a..1c52969 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -311,7 +311,7 @@
 
 	if (item->ci_parent)
 		parent = item->ci_parent->ci_dentry;
-	else if (configfs_mount && configfs_mount->mnt_sb)
+	else if (configfs_mount)
 		parent = configfs_mount->mnt_root;
 	else
 		return -EFAULT;