ASoC: Intel: sof_sdw_rt1308: add extra check on init

Apply same test as for other amplifiers - in case we enable feedback
one day.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20201002211902.287692-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw_rt1308.c

@@ -132,6 +132,10 @@ int sof_sdw_rt1308_init(const struct snd_soc_acpi_link_adr *link,
 			struct sof_sdw_codec_info *info,
 			bool playback)
 {
+	/* Count amp number and do init on playback link only. */
+	if (!playback)
+		return 0;
+
 	info->amp_num++;
 	if (info->amp_num == 1)
 		dai_links->init = first_spk_init;