hw/audio: convert exit callback in HDACodecDeviceClass to void

The exit callback always return 0, convert it to void
Signed-off-by: NZihan Yang <tgnyang@gmail.com>
Message-id: 1493211188-24086-5-git-send-email-tgnyang@gmail.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/audio/hda-codec.c

@@ -520,7 +520,7 @@ static int hda_audio_init(HDACodecDevice *hda, const struct desc_codec *desc)
     return 0;
 }
 
-static int hda_audio_exit(HDACodecDevice *hda)
+static void hda_audio_exit(HDACodecDevice *hda)
 {
     HDAAudioState *a = HDA_AUDIO(hda);
     HDAAudioStream *st;
@@ -539,7 +539,6 @@ static int hda_audio_exit(HDACodecDevice *hda)
         }
     }
     AUD_remove_card(&a->card);
-    return 0;
 }
 
 static int hda_audio_post_load(void *opaque, int version)

hw/audio/intel-hda.h

@@ -38,7 +38,7 @@ typedef struct HDACodecDeviceClass
     DeviceClass parent_class;
 
     int (*init)(HDACodecDevice *dev);
-    int (*exit)(HDACodecDevice *dev);
+    void (*exit)(HDACodecDevice *dev);
     void (*command)(HDACodecDevice *dev, uint32_t nid, uint32_t data);
     void (*stream)(HDACodecDevice *dev, uint32_t stnr, bool running, bool output);
 } HDACodecDeviceClass;