audio: remove unused function audio_is_cleaning_up()

The previous commit removed the last call site of
audio_is_cleaning_up(). Remove the now unused function.

Tested-by: Howard Spoelstra <hsp.cat7@gmail.com>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 20201213130528.5863-4-vr_qemu@t-online.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

audio/audio.c

@@ -1588,13 +1588,6 @@ static void audio_vm_change_state_handler (void *opaque, int running,
     audio_reset_timer (s);
 }
 
-static bool is_cleaning_up;
-
-bool audio_is_cleaning_up(void)
-{
-    return is_cleaning_up;
-}
-
 static void free_audio_state(AudioState *s)
 {
     HWVoiceOut *hwo, *hwon;
@@ -1647,7 +1640,6 @@ static void free_audio_state(AudioState *s)
 
 void audio_cleanup(void)
 {
-    is_cleaning_up = true;
     while (!QTAILQ_EMPTY(&audio_states)) {
         AudioState *s = QTAILQ_FIRST(&audio_states);
         QTAILQ_REMOVE(&audio_states, s, list);

audio/audio.h

@@ -160,7 +160,6 @@ static inline void *advance (void *p, int incr)
 int wav_start_capture(AudioState *state, CaptureState *s, const char *path,
                       int freq, int bits, int nchannels);
 
-bool audio_is_cleaning_up(void);
 void audio_cleanup(void);
 
 void audio_sample_to_uint64(const void *samples, int pos,