backlight: pwm_bl: Remove error message upon devm_kzalloc() failure

No need to have a specific OOM message, since there is generic MM out of memory
message in place.

Signed-off-by: Fabio Estevam <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/video/backlight/pwm_bl.c

···
 
 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);
 	if (!pb) {
-		dev_err(&pdev->dev, "no memory for state\n");
 		ret = -ENOMEM;
 		goto err_alloc;
 	}