block/backup: disable copy_range for compressed backup
Enabled by default copy_range ignores compress option. It's definitely
unexpected for user.
It's broken since introduction of copy_range usage in backup in
9ded4a011496.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id:
20190730163251.755248-3-vsementsov@virtuozzo.com
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>