Input: ab8500-ponkey - drop unnecessary call to platform_set_drvdata

There is no call to platform_get_drvdata() or dev_get_drvdata().
Drop the unnecessary call to platform_set_drvdata().
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/ab8500-ponkey.c

@@ -109,7 +109,6 @@ static int ab8500_ponkey_probe(struct platform_device *pdev)
 		return error;
 	}
 
-	platform_set_drvdata(pdev, ponkey);
 	return 0;
 }