Input: opencores-kbd - 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 <[e-mail]>
Cc: Javier Herrero <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/keyboard/opencores-kbd.c

···
 	input_unregister_device(opencores_kbd->input);
 	kfree(opencores_kbd);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }