block: Assert that flags are in range
Add a new BDRV_REQ_MASK constant, and use it to make sure that caller flags are always valid. Tested with 'make check' and with qemu-iotests on both '-raw' and '-qcow2'; the only failure turned up was fixed in the previous commit. Signed-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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