drm/mediatek: Fix uninitialized symbol

Fix Smatch static checker warning
  -Fix uninitialized symbol comp_pdev in mtk_ddp_comp_init.

Fixes: 0d9eee9 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195")
Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230803094843.4439-1-nancy.lin@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

Author: Nancy.Lin

drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c

@@ -563,14 +563,15 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
 	/* Not all drm components have a DTS device node, such as ovl_adaptor,
 	 * which is the drm bring up sub driver
 	 */
-	if (node) {
-		comp_pdev = of_find_device_by_node(node);
-		if (!comp_pdev) {
-			DRM_INFO("Waiting for device %s\n", node->full_name);
-			return -EPROBE_DEFER;
-		}
-		comp->dev = &comp_pdev->dev;
+	if (!node)
+		return 0;
+
+	comp_pdev = of_find_device_by_node(node);
+	if (!comp_pdev) {
+		DRM_INFO("Waiting for device %s\n", node->full_name);
+		return -EPROBE_DEFER;
 	}
+	comp->dev = &comp_pdev->dev;
 
 	if (type == MTK_DISP_AAL ||
 	    type == MTK_DISP_BLS ||
@@ -580,7 +581,6 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
 	    type == MTK_DISP_MERGE ||
 	    type == MTK_DISP_OVL ||
 	    type == MTK_DISP_OVL_2L ||
-	    type == MTK_DISP_OVL_ADAPTOR ||
 	    type == MTK_DISP_PWM ||
 	    type == MTK_DISP_RDMA ||
 	    type == MTK_DPI ||