ASoC: soc-pcm: fix the return value in dpcm_apply_symmetry()

In case, where the loops are not executed for a reason, the uninitialized
variable 'err' is returned to the caller. Make code fully predictible
and assign zero in the declaration.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Cc: Mark Brown <broonie@kernel.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/20210614071746.1787072-1-perex@perex.czSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -1700,7 +1700,7 @@ static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
 	struct snd_soc_dpcm *dpcm;
 	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
 	struct snd_soc_dai *fe_cpu_dai;
-	int err;
+	int err = 0;
 	int i;
 
 	/* apply symmetry for FE */