v4l2: camera: Merge getStreamConfig() with open()

The V4L2CameraProxy always calls V4L2Camera::getStreamConfig() right
after V4L2Camera::open(), and never afterwards. Simplify the code by
returning the initial configuration from V4L2Camera::open() and removing
V4L2Camera::getStreamConfig().

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

src/v4l2/v4l2_camera_proxy.cpp

@@ -63,13 +63,12 @@ int V4L2CameraProxy::open(V4L2CameraFile *file)
 	 * with count = 0.
 	 */
 
-	int ret = vcam_->open();
+	int ret = vcam_->open(&streamConfig_);
 	if (ret < 0) {
 		refcount_--;
 		return ret;
 	}
 
-	vcam_->getStreamConfig(&streamConfig_);
 	setFmtFromConfig(streamConfig_);
 
 	files_.insert(file);