ASoC: Intel: hda_dsp_common: use static function in conditional block

cppcheck reports the following warning:

sound/soc/intel/boards/hda_dsp_common.c:17:0: style: The function
'hda_dsp_hdmi_pcm_handle' is never used. [unusedFunction]

Fix by moving to static inside compilation block.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Jaska Uimonen <jaska.uimonen@intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200923072939.3100468-1-kai.vehmanen@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/hda_dsp_common.c

@@ -10,12 +10,14 @@
 
 #include "hda_dsp_common.h"
 
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+
 /*
  * Search card topology and return PCM device number
  * matching Nth HDMI device (zero-based index).
  */
-struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
-					int hdmi_idx)
+static struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
+					       int hdmi_idx)
 {
 	struct snd_soc_pcm_runtime *rtd;
 	struct snd_pcm *spcm;
@@ -34,7 +36,6 @@ struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
 	return NULL;
 }
 
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
 /*
  * Search card topology and register HDMI PCM related controls
  * to codec driver.

sound/soc/intel/boards/hda_dsp_common.h

@@ -15,9 +15,6 @@
 #include <sound/hda_i915.h>
 #include "../../codecs/hdac_hda.h"
 
-struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
-					int hdmi_idx);
-
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
 int hda_dsp_hdmi_build_controls(struct snd_soc_card *card,
 				struct snd_soc_component *comp);