power_supply: 88pm860x_charger: do not pass NULL to power_supply_put

In the case where power_supply_get_by_name returns NULL the current
error return path calls power_supply_put with a NULL psy which will
cause a null pointer dereference.  Avoid this with an immediate
return.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/power/88pm860x_charger.c

@@ -435,7 +435,7 @@ static irqreturn_t pm860x_temp_handler(int irq, void *data)
 
 	psy = power_supply_get_by_name(pm860x_supplied_to[0]);
 	if (!psy)
-		goto out;
+		return IRQ_HANDLED;
 	ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &temp);
 	if (ret)
 		goto out;