linux-imx

btrfs: drop useless member qgroup_reserved of btrfs_pending_snapshot

Since there is no more use of qgroup_reserved member in struct
btrfs_pending_snapshot, remove it.

Signed-off-by: Gu JinXiang <gujx@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>