libcamera: Use simpler Signal::disconnect() function

When disconnecting a signal from a receiver, it is usually not necessary
to specify the receiver's slot function explicitly, as the signal is
often connected to a single slot for a given receiver. We can thus use a
simpler version of Signal::disconnect() that takes a pointer to the
receiver object only. This reduces code size, as the disconnect()
function is a template function.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

src/lc-compliance/simple_capture.cpp

@@ -62,7 +62,7 @@ void SimpleCapture::stop()
 
 	camera_->stop();
 
-	camera_->requestCompleted.disconnect(this, &SimpleCapture::requestComplete);
+	camera_->requestCompleted.disconnect(this);
 
 	Stream *stream = config_->at(0).stream();
 	allocator_->free(stream);

src/libcamera/camera_manager.cpp

@@ -170,7 +170,7 @@ void CameraManager::Private::createPipelineHandlers()
 
 void CameraManager::Private::cleanup()
 {
-	enumerator_->devicesAdded.disconnect(this, &Private::createPipelineHandlers);
+	enumerator_->devicesAdded.disconnect(this);
 
 	/*
 	 * Release all references to cameras to ensure they all get destroyed

src/qcam/main_window.cpp

@@ -536,7 +536,7 @@ int MainWindow::startCapture()
 	return 0;
 
 error_disconnect:
-	camera_->requestCompleted.disconnect(this, &MainWindow::requestComplete);
+	camera_->requestCompleted.disconnect(this);
 	camera_->stop();
 
 error:
@@ -577,7 +577,7 @@ void MainWindow::stopCapture()
 	if (ret)
 		qInfo() << "Failed to stop capture";
 
-	camera_->requestCompleted.disconnect(this, &MainWindow::requestComplete);
+	camera_->requestCompleted.disconnect(this);
 
 	for (auto &iter : mappedBuffers_) {
 		const Span<uint8_t> &buffer = iter.second;