[virtmagma] Add VIRTIO_MAGMA_CMD_RELEASE_BUFFER_HANDLE

Change-Id: I1bd2e9f4fddca4a4c428fb2140c09254532d61b8
diff --git a/drivers/virtio/virtio_magma.c b/drivers/virtio/virtio_magma.c
index 1c3978f..26ed77b 100644
--- a/drivers/virtio/virtio_magma.c
+++ b/drivers/virtio/virtio_magma.c
@@ -1329,6 +1329,7 @@
 	case VIRTIO_MAGMA_CMD_WAIT_NOTIFICATION_CHANNEL:
 	case VIRTIO_MAGMA_CMD_DEVICE_IMPORT:
 	case VIRTIO_MAGMA_CMD_DEVICE_RELEASE:
+	case VIRTIO_MAGMA_CMD_RELEASE_BUFFER_HANDLE:
 		ret = vq_out_send_sync(instance->vi, &command);
 		if (!ret)
 			ret = virtmagma_check_expected_response_type(