v4l2: v4l2_camera_proxy: Clear reserved field in reqbufs

Clear the reserved field in arg struct v4l2_reqbuffers of
VIDIOC_REQBUFS.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/v4l2/v4l2_camera_proxy.cpp

@@ -351,6 +351,7 @@ int V4L2CameraProxy::vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuf
 		return -EBUSY;
 
 	arg->capabilities = V4L2_BUF_CAP_SUPPORTS_MMAP;
+	memset(arg->reserved, 0, sizeof(arg->reserved));
 
 	if (arg->count == 0) {
 		freeBuffers();