twl4030_charger: Remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or on
probe failure, since commit 0998d0631001288a5974afc0b2a5f568bcdecb4d
(device-core: Ensure drvdata = NULL when no driver is bound). Thus, it is
not needed to manually clear the device driver data to NULL.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index bed4581..be98e70 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -594,7 +594,6 @@
 fail_register_usb:
 	power_supply_unregister(&bci->ac);
 fail_register_ac:
-	platform_set_drvdata(pdev, NULL);
 	kfree(bci);
 
 	return ret;
@@ -622,7 +621,6 @@
 	free_irq(bci->irq_chg, bci);
 	power_supply_unregister(&bci->usb);
 	power_supply_unregister(&bci->ac);
-	platform_set_drvdata(pdev, NULL);
 	kfree(bci);
 
 	return 0;