btrfs: remove err variable from btrfs_delete_subvolume
Use only a single 'ret' to control whether we should abort the transaction or not. That's fine, because if we abort a transaction then btrfs_end_transaction will return the same value as passed to btrfs_abort_transaction. No semantic changes. Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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