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 <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: kernel test robot <[e-mail]>
Reviewed-by: Sandor Yu <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/YmFzutFV/iDyEQF2@dd18de969aa6

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

···
 			   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);
···
 				   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)
···
 			     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,