Fixed a bug that the system hangs with an assert in DiskIo.c that is division overflo...

Root cause is that Read Capacity command returns media not present error, then UsbMassStorage driver issues Sense Request command to get the sense data. However, the USB floppy drive still returns the previous error for the Sense Request command. UsbBootRequestSense() does not handle this case correctly and returns EFI_SUCCESS so that the block size of the Block IO protocol instance is set to be 0.

Solution is to fix the logic to handle the case and add protective logic to avoid setting block size to be 0.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8979 6f19259b-4bc3-4df7-8a09-765794883524