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 <[e-mail]>
Signed-off-by: Anton Vorontsov <[e-mail]>

drivers/power/bq27x00_battery.c

···
 	return 0;
 
 err_free:
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return ret;
···
 
 	bq27x00_powersupply_unregister(di);
 
-	platform_set_drvdata(pdev, NULL);
 	kfree(di);
 
 	return 0;