When a scsi-disk object receives VERIFY command with BYTCHK bit being zero,
scsi_block_is_passthrough returns false and finally makes req being proceeded
by scsi_block_dma_command. Because scsi_block_dma_command has removed process
of VERIFY, QEMU will abort in this function.
Reported-by: NJunlian Bell <zhongjun@sangfor.com.cn>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>