power: supply: ab8500_charger: Fix inconsistent IS_ERR and PTR_ERR

Fix inconsistent IS_ERR and PTR_ERR in ab8500_charger_probe().

The proper pointer to be passed as argument is di->adc_main_charger_c

This bug was detected with the help of Coccinelle.

Fixes: 97ab78bac5 ("power: supply: ab8500_charger: Convert to IIO ADC")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/ab8500_charger.c

@@ -3393,7 +3393,7 @@ static int ab8500_charger_probe(struct platform_device *pdev)
 		if (PTR_ERR(di->adc_main_charger_c) == -ENODEV)
 			return -EPROBE_DEFER;
 		dev_err(&pdev->dev, "failed to get ADC main charger current\n");
-		return PTR_ERR(di->adc_main_charger_v);
+		return PTR_ERR(di->adc_main_charger_c);
 	}
 	di->adc_vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
 	if (IS_ERR(di->adc_vbus_v)) {