v4l2: camera_proxy: Call V4L2Camera::getBufferFd() directly

The V4L2Camera::getBufferFd() method doesn't need to run in the camera
thread. Call it directly.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/v4l2/v4l2_camera_proxy.cpp

@@ -92,8 +92,7 @@ void *V4L2CameraProxy::mmap(void *addr, size_t length, int prot, int flags,
 		return MAP_FAILED;
 	}
 
-	FileDescriptor fd = vcam_->invokeMethod(&V4L2Camera::getBufferFd,
-						ConnectionTypeBlocking, index);
+	FileDescriptor fd = vcam_->getBufferFd(index);
 	if (!fd.isValid()) {
 		errno = EINVAL;
 		return MAP_FAILED;