ALSA: hda - hdmi: Add error-checking to some codec reads

Add error checks to HBR status reads (both generic and ATI/AMD) and
ATI/AMD codec reads for ELD generation.

Unchecked errors in these just caused more errors later on (invalid
codec writes for the HBR ones and ELD parsing errors for the ATI/AMD ELD
ones), but it is better to catch them earlier.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

@@ -1247,6 +1247,9 @@ static int hdmi_pin_hbr_setup(struct hda_codec *codec, hda_nid_t pin_nid,
 		pinctl = snd_hda_codec_read(codec, pin_nid, 0,
 					    AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
 
+		if (pinctl < 0)
+			return hbr ? -EINVAL : 0;
+
 		new_pinctl = pinctl & ~AC_PINCTL_EPT;
 		if (hbr)
 			new_pinctl |= AC_PINCTL_EPT_HBR;
@@ -3091,7 +3094,7 @@ static int atihdmi_pin_hbr_setup(struct hda_codec *codec, hda_nid_t pin_nid,
 	int hbr_ctl, hbr_ctl_new;
 
 	hbr_ctl = snd_hda_codec_read(codec, pin_nid, 0, ATI_VERB_GET_HBR_CONTROL, 0);
-	if (hbr_ctl & ATI_HBR_CAPABLE) {
+	if (hbr_ctl >= 0 && (hbr_ctl & ATI_HBR_CAPABLE)) {
 		if (hbr)
 			hbr_ctl_new = hbr_ctl | ATI_HBR_ENABLE;
 		else