btrfs: don't try to delete RAID stripe-extents if we don't need to

btrfs: don't try to delete RAID stripe-extents if we don't need to

Even if the RAID stripe-tree is not enabled in the filesystem,
do_free_extent_accounting() still calls into btrfs_delete_raid_extent().

Check if the extent in question is on a block-group that has a profile
which is used by RAID stripe-tree before attempting to delete a stripe
extent. Return early if it doesn't, otherwise we're doing a unnecessary
search.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>