power: supply: ab8500: Clean some error messages

There is an useless extra comma at the end of some error messages, remove
them.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/e7ac0fa83c6100cbe4e0efa90cf99291c2423b10.1719037737.git.christophe.jaillet@wanadoo.frSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/ab8500_charger.c

@@ -491,7 +491,7 @@ static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 		ret = iio_read_channel_processed_scale(di->adc_main_charger_v,
 						       &vch, 1000);
 		if (ret < 0) {
-			dev_err(di->dev, "%s ADC conv failed,\n", __func__);
+			dev_err(di->dev, "%s ADC conv failed\n", __func__);
 			return ret;
 		}
 	} else {
@@ -546,7 +546,7 @@ static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 		ret = iio_read_channel_processed_scale(di->adc_vbus_v,
 						       &vch, 1000);
 		if (ret < 0) {
-			dev_err(di->dev, "%s ADC conv failed,\n", __func__);
+			dev_err(di->dev, "%s ADC conv failed\n", __func__);
 			return ret;
 		}
 	} else {
@@ -572,7 +572,7 @@ static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 		ret = iio_read_channel_processed_scale(di->adc_usb_charger_c,
 						       &ich, 1000);
 		if (ret < 0) {
-			dev_err(di->dev, "%s ADC conv failed,\n", __func__);
+			dev_err(di->dev, "%s ADC conv failed\n", __func__);
 			return ret;
 		}
 	} else {
@@ -598,7 +598,7 @@ static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 		ret = iio_read_channel_processed_scale(di->adc_main_charger_c,
 						       &ich, 1000);
 		if (ret < 0) {
-			dev_err(di->dev, "%s ADC conv failed,\n", __func__);
+			dev_err(di->dev, "%s ADC conv failed\n", __func__);
 			return ret;
 		}
 	} else {