libcamera: pipeline_handler: Disconnect MediaDevice::disconnected signal

The pipeline handler connects the disconnected signal of MediaDevice
instances registered for hotplug handling to a member slot. Disconnect
the signal when the slot is called, as the pipeline handler will be
deleted.

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

src/libcamera/pipeline_handler.cpp

@@ -241,6 +241,8 @@ void PipelineHandler::hotplugMediaDevice(MediaDevice *media)
  */
 void PipelineHandler::mediaDeviceDisconnected(MediaDevice *media)
 {
+	media->disconnected.disconnect(this);
+
 	if (cameras_.empty())
 		return;