iio: adc: bcm_iproc_adc: drop a stray semicolon

Found by coccinelle / coccicheck

CHECK   drivers/iio/adc/bcm_iproc_adc.c
drivers/iio/adc/bcm_iproc_adc.c:311:3-4: Unneeded semicolon
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>

drivers/iio/adc/bcm_iproc_adc.c

@@ -308,7 +308,7 @@ static int iproc_adc_do_read(struct iio_dev *indio_dev,
 				"IntMask set failed. Read will likely fail.");
 			read_len = -EIO;
 			goto adc_err;
-		};
+		}
 	}
 	regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check);