drm: bridge: dw_hdmi: Audio: fix returnvar.cocci warnings

drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c:80:5-8: Unneeded variable: "ret". Return "0" on line 94
drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c:105:5-8: Unneeded variable: "ret". Return "0" on line 112

 Remove unneeded variable used to store return value.

Generated by: scripts/coccinelle/misc/returnvar.cocci

CC: Sandor Yu <Sandor.yu@nxp.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Reviewed-by: Sandor Yu <Sandor.yu@nxp.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YmFzutFV/iDyEQF2@dd18de969aa6

drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c

@@ -77,7 +77,6 @@ static int audio_hw_params(struct device *dev,  void *data,
 			   struct hdmi_codec_params *params)
 {
 	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
-	int ret = 0;
 	u8 ca;
 
 	dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
@@ -91,7 +90,7 @@ static int audio_hw_params(struct device *dev,  void *data,
 				   params->iec.status[0] & IEC958_AES0_NONAUDIO);
 	dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
 
-	return ret;
+	return 0;
 }
 
 static void audio_shutdown(struct device *dev, void *data)
@@ -102,14 +101,13 @@ static int audio_mute_stream(struct device *dev, void *data,
 			     bool enable, int direction)
 {
 	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
-	int ret = 0;
 
 	if (!enable)
 		dw_hdmi_audio_enable(dw->data.hdmi);
 	else
 		dw_hdmi_audio_disable(dw->data.hdmi);
 
-	return ret;
+	return 0;
 }
 
 static int audio_get_eld(struct device *dev, void *data,