ASoC: Intel: cht: fix uninit variable warning

Kbuild bot reports that we might use dai_index uninitialized.

sound/soc/intel/boards/cht_bsw_rt5645.c:391:37: warning: 'dai_index' may be used uninitialized in this function [-Wmaybe-uninitialized]

Since it is theoretically possible, set it while initializing.
Signed-off-by: NVinod Koul <vinod.koul@intel.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/intel/boards/cht_bsw_rt5645.c

@@ -357,7 +357,7 @@ static int snd_cht_mc_probe(struct platform_device *pdev)
 	char codec_name[16];
 	struct sst_acpi_mach *mach;
 	const char *i2c_name = NULL;
-	int dai_index;
+	int dai_index = 0;
 
 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_ATOMIC);
 	if (!drv)