pwm: mtk-disp: Don't check the return code of pwmchip_remove()

pwmchip_remove() returns always 0. Don't use the value to make it
possible to eventually change the function to return void. Also the
driver core ignores the return value of mtk_disp_pwm_remove().

Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/pwm/pwm-mtk-disp.c

···
 static int mtk_disp_pwm_remove(struct platform_device *pdev)
 {
 	struct mtk_disp_pwm *mdp = platform_get_drvdata(pdev);
-	int ret;
 
-	ret = pwmchip_remove(&mdp->chip);
+	pwmchip_remove(&mdp->chip);
 	clk_unprepare(mdp->clk_mm);
 	clk_unprepare(mdp->clk_main);
 
-	return ret;
+	return 0;
 }
 
 static const struct mtk_pwm_data mt2701_pwm_data = {