Code cleanup: fix a few harmless warnings.

source/blender/draw/intern/draw_manager_data.c

@@ -465,8 +465,7 @@ static void drw_interface_batching_init(
 		case DRW_SHG_POINT_BATCH: type = GWN_PRIM_POINTS; break;
 		case DRW_SHG_LINE_BATCH: type = GWN_PRIM_LINES; break;
 		case DRW_SHG_TRIANGLE_BATCH: type = GWN_PRIM_TRIS; break;
-		default:
-			BLI_assert(0);
+		default: type = GWN_PRIM_NONE; BLI_assert(0); break;
 	}
 
 	DRW_batching_buffer_request(DST.idatalist, format, type, shgroup,

source/blender/editors/space_outliner/outliner_collections.c

@@ -656,7 +656,7 @@ static int object_add_to_new_collection_exec(bContext *C, wmOperator *op)
 	SceneCollection *scene_collection_parent, *scene_collection_new;
 	TreeElement *te_active, *te_parent;
 
-	struct ObjectsSelectedData data = {NULL}, active = {NULL};
+	struct ObjectsSelectedData data = {{NULL}}, active = {{NULL}};
 
 	outliner_tree_traverse(soops, &soops->tree, 0, TSE_HIGHLIGHTED, outliner_find_selected_objects, &active);
 	if (BLI_listbase_is_empty(&active.objects_selected_array)) {

source/blender/editors/space_view3d/space_view3d.c

@@ -1072,7 +1072,7 @@ static void view3d_main_region_message_subscribe(
 	 *
 	 * For other space types we might try avoid this, keep the 3D view as an exceptional case! */
 	ViewRender *view_render = BKE_viewrender_get(scene, workspace);
-	wmMsgParams_RNA msg_key_params = {0};
+	wmMsgParams_RNA msg_key_params = {{{0}}};
 
 	/* Only subscribe to types. */
 	StructRNA *type_array[] = {

source/blender/python/gawain/gwn_py_types.c

@@ -117,7 +117,7 @@ static int bpygwn_ParseVertFetchMode(PyObject *o, void *p)
 		} \
 	} ((void)0)
 
-	Gwn_VertCompType mode;
+	Gwn_VertFetchMode mode;
 	MATCH_ID(FLOAT);
 	MATCH_ID(INT);
 	MATCH_ID(INT_TO_FLOAT_UNIT);
@@ -168,7 +168,7 @@ static int bpygwn_ParsePrimType(PyObject *o, void *p)
 	return 0;
 
 success:
-	(*(Gwn_VertFetchMode *)p) = mode;
+	(*(Gwn_PrimType *)p) = mode;
 	return 1;
 }
 

source/blender/python/intern/bpy_msgbus.c

@@ -273,7 +273,7 @@ static PyObject *bpy_msgbus_subscribe_rna(PyObject *UNUSED(self), PyObject *args
 	/* Note: we may want to have a way to pass this in. */
 	bContext *C = (bContext *)BPy_GetContext();
 	struct wmMsgBus *mbus = CTX_wm_message_bus(C);
-	wmMsgParams_RNA msg_key_params = {0};
+	wmMsgParams_RNA msg_key_params = {{{0}}};
 
 	wmMsgSubscribeValue msg_val_params = {0};
 
@@ -349,7 +349,7 @@ static PyObject *bpy_msgbus_publish_rna(PyObject *UNUSED(self), PyObject *args,
 	/* Note: we may want to have a way to pass this in. */
 	bContext *C = (bContext *)BPy_GetContext();
 	struct wmMsgBus *mbus = CTX_wm_message_bus(C);
-	wmMsgParams_RNA msg_key_params = {0};
+	wmMsgParams_RNA msg_key_params = {{{0}}};
 
 	if (py_msgbus_rna_key_from_py(py_sub, &msg_key_params, error_prefix) == -1) {
 		return NULL;