video: fbdev: atmel_lcdfb: fix return error code in atmel_lcdfb_of_init()

If devm_kzalloc() failed after the first time, atmel_lcdfb_of_init()
can't return -ENOMEM, fix this by putting the error code in loop.

Fixes: b985172b ("video: atmel_lcdfb: add device tree suport")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20201117061350.3453742-1-yangyingliang@huawei.com

drivers/video/fbdev/atmel_lcdfb.c

@@ -987,8 +987,8 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
 	}
 
 	INIT_LIST_HEAD(&pdata->pwr_gpios);
-	ret = -ENOMEM;
 	for (i = 0; i < gpiod_count(dev, "atmel,power-control"); i++) {
+		ret = -ENOMEM;
 		gpiod = devm_gpiod_get_index(dev, "atmel,power-control",
 					     i, GPIOD_ASIS);
 		if (IS_ERR(gpiod))