btrfs: fix memory leak in update_space_info failure path

If we fail to add the space_info kobject, we'll leak the memory
for the percpu counter.

Fixes: 6ab0a20 (btrfs: publish allocation data in sysfs)
Cc: <[email protected]> # v3.14+
Signed-off-by: Jeff Mahoney <[email protected]>
Reviewed-by: Liu Bo <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: jeffmahoney

fs/btrfs/extent-tree.c

@@ -3993,6 +3993,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
 				    info->space_info_kobj, "%s",
 				    alloc_name(found->flags));
 	if (ret) {
+		percpu_counter_destroy(&found->total_bytes_pinned);
 		kfree(found);
 		return ret;
 	}