ASoC: fsl: mpc8610: remove useless assignment

cppcheck warning:

sound/soc/fsl/mpc8610_hpcd.c:333:6: style: Redundant initialization
for 'ret'. The initialized value is overwritten before it is
read. [redundantInitialization]
 ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
     ^
sound/soc/fsl/mpc8610_hpcd.c:193:10: note: ret is initialized
 int ret = -ENODEV;
         ^
sound/soc/fsl/mpc8610_hpcd.c:333:6: note: ret is overwritten
 ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
     ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210219232937.6440-9-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/mpc8610_hpcd.c

@@ -190,7 +190,7 @@ static int mpc8610_hpcd_probe(struct platform_device *pdev)
 	struct device_node *codec_np = NULL;
 	struct mpc8610_hpcd_data *machine_data;
 	struct snd_soc_dai_link_component *comp;
-	int ret = -ENODEV;
+	int ret;
 	const char *sprop;
 	const u32 *iprop;