drm/rockchip: dsi: Remove unnecessary platform_get_resource() error check

devm_ioremap_resource() already checks if the resource is NULL, so
remove the unnecessary platform_get_resource() error check.

Cc: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1513602150-7542-3-git-send-email-festevam@gmail.com

drivers/gpu/drm/rockchip/dw-mipi-dsi.c

@@ -1202,9 +1202,6 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 		return ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
 	dsi->base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(dsi->base))
 		return PTR_ERR(dsi->base);