iio: adc: at91-sama5d2_adc: remove unneeded semicolon

A semicolon is not needed after a switch statement.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20201027200853.1596699-1-trix@redhat.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/at91-sama5d2_adc.c

@@ -1472,7 +1472,7 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
 		return 0;
 	default:
 		return -EINVAL;
-	};
+	}
 }
 
 static void at91_adc_dma_init(struct platform_device *pdev)