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/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