btrfs: remove unnecessary leaf check at btrfs_tree_mod_log_free_eb()

At btrfs_tree_mod_log_free_eb() we check if we are dealing with a leaf,
and if so, return immediately and do nothing. However this check can be
removed, because after it we call tree_mod_need_log(), which returns
false when given an extent buffer that corresponds to a leaf.

So just remove the leaf check and pass the extent buffer to
tree_mod_need_log().

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tree-mod-log.c

@@ -554,10 +554,7 @@ int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb)
 	int i;
 	int ret = 0;
 
-	if (btrfs_header_level(eb) == 0)
-		return 0;
-
-	if (!tree_mod_need_log(eb->fs_info, NULL))
+	if (!tree_mod_need_log(eb->fs_info, eb))
 		return 0;
 
 	nritems = btrfs_header_nritems(eb);