bq27x00_battery: 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/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 26037ca..b309713 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -966,7 +966,6 @@
 	return 0;
 
 err_free:
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return ret;
@@ -978,7 +977,6 @@
 
 	bq27x00_powersupply_unregister(di);
 
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return 0;