drm/stm: ltdc: 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: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1513602150-7542-6-git-send-email-festevam@gmail.com

drivers/gpu/drm/stm/ltdc.c

@@ -901,12 +901,6 @@ int ltdc_load(struct drm_device *ddev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		DRM_ERROR("Unable to get resource\n");
-		ret = -ENODEV;
-		goto err;
-	}
-
 	ldev->regs = devm_ioremap_resource(dev, res);
 	if (IS_ERR(ldev->regs)) {
 		DRM_ERROR("Unable to get ltdc registers\n");