ASoC: bcm: cygnus-pcm: Unneeded variable: "ret".

This patch fixes below issues reported by coccicheck

sound/soc/bcm/cygnus-pcm.c:642:5-8: Unneeded variable: "ret". Return "0"
on line 650
sound/soc/bcm/cygnus-pcm.c:671:5-8: Unneeded variable: "ret". Return "0"
on line 696

We cannot change return type of these functions as they are callback
functions of snd_pcm_ops
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Link: https://lore.kernel.org/r/20190709184236.GA7873@hari-Inspiron-1545Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-pcm.c

@@ -639,7 +639,6 @@ static int cygnus_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct cygnus_aio_port *aio;
-	int ret = 0;
 
 	aio = cygnus_dai_get_dma_data(substream);
 	dev_dbg(rtd->cpu_dai->dev, "%s  port %d\n", __func__, aio->portnum);
@@ -647,7 +646,7 @@ static int cygnus_pcm_hw_params(struct snd_pcm_substream *substream,
 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 	runtime->dma_bytes = params_buffer_bytes(params);
 
-	return ret;
+	return 0;
 }
 
 static int cygnus_pcm_hw_free(struct snd_pcm_substream *substream)
@@ -668,7 +667,6 @@ static int cygnus_pcm_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct cygnus_aio_port *aio;
 	unsigned long bufsize, periodsize;
-	int ret = 0;
 	bool is_play;
 	u32 start;
 	struct ringbuf_regs *p_rbuf = NULL;
@@ -693,7 +691,7 @@ static int cygnus_pcm_prepare(struct snd_pcm_substream *substream)
 	ringbuf_set_initial(aio->cygaud->audio, p_rbuf, is_play, start,
 				periodsize, bufsize);
 
-	return ret;
+	return 0;
 }
 
 static snd_pcm_uframes_t cygnus_pcm_pointer(struct snd_pcm_substream *substream)