iio/adc: ingenic: 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/20201027201128.1597230-1-trix@redhat.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ingenic-adc.c

@@ -542,7 +542,7 @@ static int ingenic_adc_read_avail(struct iio_dev *iio_dev,
 		return IIO_AVAIL_LIST;
 	default:
 		return -EINVAL;
-	};
+	}
 }
 
 static int ingenic_adc_read_chan_info_raw(struct iio_dev *iio_dev,