ASoC: codecs: wcd: Remove unneeded semicolon

Eliminate the following coccicheck warning:
./sound/soc/codecs/wcd-mbhc-v2.c:990:2-3: Unneeded semicolon.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/1623221171-105359-1-git-send-email-yang.lee@linux.alibaba.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd-mbhc-v2.c

@@ -987,7 +987,7 @@ static void wcd_mbhc_adc_update_fsm_source(struct wcd_mbhc *mbhc,
 		wcd_mbhc_write_field(mbhc, WCD_MBHC_BTN_ISRC_CTL, 0);
 		break;
 
-	};
+	}
 }
 
 static void wcd_mbhc_bcs_enable(struct wcd_mbhc *mbhc, int plug_type, bool enable)