pwm: stmpe: Drop unused setting of driver data

The driver never uses dev_get_drvdata() to retrieve the pwm driver data.
So drop setting it.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-stmpe.c

@@ -301,8 +301,6 @@ static int __init stmpe_pwm_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, pwm);
-
 	return 0;
 }