Qt: Fix audio context holding onto closed game controller

CHANGES

@@ -11,6 +11,7 @@ Bugfixes:
  - GBA Memory: Fix a few AGBPrint crashes
  - GBA Memory: Fix OOB ROM reads showing up as AGBPrint memory
  - GB Serialize: Fix loading states with negative pixel x (fixes mgba.io/i/1293)
+ - Qt: Fix audio context holding onto closed game controller
 Misc:
  - GBA Savedata: EEPROM performance fixes
  - GBA Savedata: Automatically map 1Mbit Flash files as 1Mbit Flash

src/platform/qt/Window.cpp

@@ -797,6 +797,11 @@ void Window::gameStopped() {
 	m_fpsTimer.stop();
 	m_focusCheck.stop();
 
+	if (m_audioProcessor) {
+		m_audioProcessor->stop();
+		m_audioProcessor.reset();
+	}
+
 	emit paused(false);
 }