ASoC: Intel: sof_sdw: Add NULL check in asoc_sdw_rt_dmic_rtd_init()

mic_name returned by devm_kasprintf() could be NULL.
Add a check for it.

Signed-off-by: Chenyuan Yang <chenyuan0y@gmail.com>
Fixes: bee2fe4 ("ASoC: Intel: sof_sdw: use generic rtd_init function for Realtek SDW DMICs")
Link: https://patch.msgid.link/20250415194134.292830-1-chenyuan0y@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: WhiteFox-Project

sound/soc/sdw_utils/soc_sdw_rt_dmic.c

@@ -29,6 +29,8 @@ int asoc_sdw_rt_dmic_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_da
 		mic_name = devm_kasprintf(card->dev, GFP_KERNEL, "rt715-sdca");
 	else
 		mic_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s", component->name_prefix);
+	if (!mic_name)
+		return -ENOMEM;
 
 	card->components = devm_kasprintf(card->dev, GFP_KERNEL,
 					  "%s mic:%s", card->components,