btrfs: simplify the send_in_progress check in btrfs_delete_subvolume
Only when send_in_progress, we have to do something different such as btrfs_warn() and return -EPERM. Therefore, we could check send_in_progress first and process error handling, after the root_item_lock has been got. Just for better readability. No functional change. Signed-off-by: NLu Fengqi <lufq.fnst@cn.fujitsu.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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