Add label to SampleSinkFifo to mention controlling component in error messages

plugins/channelrx/sigmffilesink/sigmffilesink.cpp

@@ -59,6 +59,11 @@ SigMFFileSink::SigMFFileSink(DeviceAPI *deviceAPI) :
     setObjectName(m_channelId);
 
     m_basebandSink = new SigMFFileSinkBaseband();
+    m_basebandSink->setFifoLabel(QString("%1 [%2:%3]")
+        .arg(m_channelId)
+        .arg(m_deviceAPI->getDeviceSetIndex())
+        .arg(getIndexInDeviceSet())
+    );
     m_basebandSink->setSpectrumSink(&m_spectrumVis);
     m_basebandSink->moveToThread(&m_thread);