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>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
 exit_nfc_init:
        release_resources(this);
 exit_acquire_resources:
-       platform_set_drvdata(pdev, NULL);
        dev_err(this->dev, "driver registration failed: %d\n", ret);
        kfree(this);
 
 
        gpmi_nfc_exit(this);
        release_resources(this);
-       platform_set_drvdata(pdev, NULL);
        kfree(this);
        return 0;
 }