power: supply: generic-adc-battery: fix unit scaling

[ Upstream commit 44263f50065969f2344808388bd589740f026167 ]

power-supply properties are reported in µV, µA and µW.
The IIO API provides mV, mA, mW, so the values need to
be multiplied by 1000.

Fixes: e60fea794e ("power: battery: Generic battery driver using IIO")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/power/supply/generic-adc-battery.c

@@ -138,6 +138,9 @@ static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
 			result);
 	if (ret < 0)
 		pr_err("read channel error\n");
+	else
+		*result *= 1000;
+
 	return ret;
 }