libcamera: camera: Remove explicit stream to buffer map in requestCompleted signal

The stream to buffer map in the requestCompleted signal is taken
directly from the request which is part of the same signal. Remove the
map as it can be fetched directly from the request.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/camera.cpp

@@ -919,7 +919,7 @@ void Camera::requestComplete(Request *request)
 			stream->unmapBuffer(buffer);
 	}
 
-	requestCompleted.emit(request, request->buffers());
+	requestCompleted.emit(request);
 	delete request;
 }