ASoC: dapm: Avoid uninitialised variable warning

[ Upstream commit fc269c0396448cabe1afd648c0b335669aa347b7 ]

Commit 4a75aae17b2a ("ASoC: dapm: Add support for multi-CODEC
CODEC to CODEC links") adds loops that iterate over multiple
CODECs in snd_soc_dai_link_event. This also introduced a compiler
warning for a potentially uninitialised variable in the case
no CODECs are present. This should never be the case as the
DAI link must by definition contain at least 1 CODEC however
probably best to avoid the compiler warning by initialising ret
to zero.
Signed-off-by: NCharles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

sound/soc/soc-dapm.c

@@ -3684,7 +3684,7 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 	struct snd_pcm_hw_params *params = NULL;
 	struct snd_pcm_runtime *runtime = NULL;
 	unsigned int fmt;
-	int ret;
+	int ret = 0;
 
 	if (WARN_ON(!config) ||
 	    WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||