qcow2: Check snapshot L1 table in qcow2_snapshot_goto()
This function copies a snapshot's L1 table into the active one without validating it first. We now have a function to take care of this, so let's use it. Cc: Eric Blake <eblake@redhat.com> Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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