qcow2: get rid of qcow2_backing_read1 routine
Since bdrv_co_preadv does all neccessary checks including reading after the end of the backing file, avoid duplication of verification before bdrv_co_preadv call. Signed-off-by: NEdgar Kaziakhmedov <edgar.kaziakhmedov@virtuozzo.com> Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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