ASoC: codecs: wcd938x: fix uninitialized symbol warnings

This patch fixes below two uninitialized symbol warnings

warning:
	sound/soc/codecs/wcd938x.c:2092 wcd938x_tx_swr_ctrl()
	error: uninitialized symbol 'rate'

	sound/soc/codecs/wcd938x.c:2189 wcd938x_tx_channel_config()
	error: uninitialized symbol 'reg'.

First one my brining in check to already existing if condition and
second one by adding a default switch case to avoid any access to reg.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210621134502.19537-2-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x.c

@@ -2085,11 +2085,9 @@ static int wcd938x_tx_swr_ctrl(struct snd_soc_dapm_widget *w,
 			}
 			rate = wcd938x_get_clk_rate(i);
 			wcd938x_set_swr_clk_rate(component, rate, bank);
-		}
-
-		if (strnstr(w->name, "ADC", sizeof("ADC")))
 			/* Copy clk settings to active bank */
 			wcd938x_set_swr_clk_rate(component, rate, !bank);
+		}
 		break;
 	case SND_SOC_DAPM_POST_PMD:
 		if (strnstr(w->name, "ADC", sizeof("ADC"))) {
@@ -2184,6 +2182,8 @@ static void wcd938x_tx_channel_config(struct snd_soc_component *component,
 		reg = WCD938X_ANA_TX_CH4;
 		mask = WCD938X_HPF4_INIT_MASK;
 		break;
+	default:
+		return;
 	}
 
 	snd_soc_component_write_field(component, reg, mask, mode);