virt: vbox: Log unknown ioctl requests as error

Every now and then upstream adds new ioctls without notifying us,
log unknown ioctl requests as an error to catch these.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Upstream Status: https://lore.kernel.org/lkml/20200520195440.38759-1-hdegoede@redhat.com/

drivers/virt/vboxguest/vboxguest_core.c

@@ -1739,7 +1739,7 @@ int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data)
 		return vbg_ioctl_log(data);
 	}
 
-	vbg_debug("VGDrvCommonIoCtl: Unknown req %#08x\n", req);
+	vbg_err("Userspace made an unknown ioctl req %#08x\n", req);
 	return -ENOTTY;
 }