ASoC: qdsp6: q6asm-dai: clean up a return

Smatch complains that if both "psubstream" and "csubstream" are NULL
then "ret" is uninitialized.  That probably can't happen, but it's
cleaner to just return zero anyway so let's do that.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/qcom/qdsp6/q6asm-dai.c

@@ -493,7 +493,7 @@ static int q6asm_dai_pcm_new(struct snd_soc_pcm_runtime *rtd)
 		}
 	}
 
-	return ret;
+	return 0;
 }
 
 static void q6asm_dai_pcm_free(struct snd_pcm *pcm)