audiounit: stop audio-unit before deactivating the audio session (closes #15984)

modules/audio_output/audiounit_ios.m

@@ -288,8 +288,6 @@ static void Stop(audio_output_t *p_aout)
     struct aout_sys_t   *p_sys = p_aout->sys;
     OSStatus status;
 
-    [[AVAudioSession sharedInstance] setActive:NO error:nil];
-
     if (p_sys->au_unit) {
         status = AudioOutputUnitStop(p_sys->au_unit);
         if (status != noErr)
@@ -305,6 +303,8 @@ static void Stop(audio_output_t *p_aout)
     }
     p_sys->i_bytes_per_sample = 0;
 
+    [[AVAudioSession sharedInstance] setActive:NO withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];
+
     /* clean-up circular buffer */
     TPCircularBufferCleanup(&p_sys->circular_buffer);
 }