Input: at32psif - remove redundant platform_set_drvdata()

Commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/serio/at32psif.c

@@ -314,8 +314,6 @@ static int __exit psif_remove(struct platform_device *pdev)
 	clk_put(psif->pclk);
 	kfree(psif);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }