block/vvfat: qcow driver may not be found
Although virtually impossible right now, bdrv_find_format("qcow") may fail. The vvfat block driver should heed that case. Cc: qemu-stable@nongnu.org Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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