ASoC: hdmi-codec: Fix hdmi_of_xlate_dai_name when #sound-dai-cells = <0>

If a DAI specifies "#sound-dai-cells = <0>" in device-tree then
hdmi_of_xlate_dai_name() will be called with zero args, which it isn't
implemented to cope with. The resulting use of an uninitialised variable
for the id will usually result in an error like:

  asoc-simple-card sound: parse error -11
  asoc-simple-card: probe of sound failed with error -11

Fix this by using and id of zero if no arg is provided.

Fixes: 9731f82d ("ASoC: hdmi-codec: enable multi probe for same device")
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hdmi-codec.c

@@ -364,7 +364,12 @@ static int hdmi_of_xlate_dai_name(struct snd_soc_component *component,
 				  struct of_phandle_args *args,
 				  const char **dai_name)
 {
-	int id = args->args[0];
+	int id;
+
+	if (args->args_count)
+		id = args->args[0];
+	else
+		id = 0;
 
 	if (id < ARRAY_SIZE(hdmi_dai_name)) {
 		*dai_name = hdmi_dai_name[id];