tools: repro: fix vm count calculation
tools: repro: fix vm count calculation

hyz0906/syzkaller,dotweiba/syzkaller,zoulasc/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,dotweiba/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,hyz0906/syzkaller,dotweiba/syzkaller,google/syzkaller,xairy/syzkaller,zoulasc/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,google/syzkaller,hyz0906/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,dotweiba/syzkaller,hyz0906/syzkaller,xairy/syzkaller,zoulasc/syzkaller,google/syzkaller