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Description of problem:
Doesn't check disk format when using format=raw

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.Boot up guest with command
/usr/libexec/qemu-kvm \
 -m 8133 -smp 8 \
 -boot menu=on \
 -device virtio-scsi-pci \
 -device scsi-hd,id=scsi-hd0,drive=scsi-hd0-dr0,bootindex=1 \
 -drive file=/home/rhel810-64-virtio-scsi.qcow2,if=none,id=scsi-hd0-dr0,format=raw,cache=none \
 -device nec-usb-xhci,id=xhci,bus=pci.0,addr=0x5 \
 -vga std \
 -vnc :9 \
 -device usb-tablet,id=tablet \
 -nographic \
 -device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
 -netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
 -rtc base=utc,clock=vm\

2.
3.

Actual results:
Boot up vm successfully,but failed to find booting device. 

Expected results:
Should check disk format before booting up guest and failed to boot up with error message like this:
qemu-kvm: -drive file=/home/kvm_autotest_root/images/rhel77-64-virtio-scsi.raw,if=none,id=scsi-hd0-dr0,format=qcow2,cache=none: Image is not in qcow2 format


Additional info:

Same problem on x86.