fbdev: omapfb: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexios Zavras <alexios.zavras@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Allison Randal <allison@lohutok.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190904115406.23880-1-yuehaibing@huawei.com

drivers/video/fbdev/omap2/omapfb/vrfb.c

@@ -339,9 +339,7 @@ static int __init vrfb_probe(struct platform_device *pdev)
 	int i;
 
 	/* first resource is the register res, the rest are vrfb contexts */
-
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	vrfb_base = devm_ioremap_resource(&pdev->dev, mem);
+	vrfb_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(vrfb_base))
 		return PTR_ERR(vrfb_base);