mfd: pm8921: 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: Lee Jones <lee.jones@linaro.org>

drivers/mfd/pm8921-core.c

@@ -160,7 +160,6 @@ static int pm8921_probe(struct platform_device *pdev)
 
 err:
 	mfd_remove_devices(pmic->dev);
-	platform_set_drvdata(pdev, NULL);
 err_read_rev:
 	kfree(pmic);
 	return rc;
@@ -180,7 +179,6 @@ static int pm8921_remove(struct platform_device *pdev)
 		pm8xxx_irq_exit(pmic->irq_chip);
 		pmic->irq_chip = NULL;
 	}
-	platform_set_drvdata(pdev, NULL);
 	kfree(pmic);
 
 	return 0;