vpc: fix return value check for blk_pwrite
bdrv_pwrite_sync used to return zero or negative error, while blk_pwrite returns the number of written bytes when successful. This caused VPC image creation to fail spectacularly: it wrote the first 512 bytes, and then exited immediately because of the non-zero answer from blk_pwrite. But the truly spectacular part is that it returns a positive value (the 512 that blk_pwrite returned) causing everyone to believe that it succeeded. This fixes qemu-iotests with vpc format. Fixes: b8f45cdfSigned-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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