fix two reading uninitialized pointers

fixed in:
tools/editor/project_settings.cpp
scene/gui/graph_edit.cpp

scene/gui/graph_edit.cpp

@@ -617,7 +617,7 @@ void GraphEdit::_input_event(const InputEvent& p_ev) {
 
 		if (b.button_index==BUTTON_LEFT && b.pressed) {
 
-			GraphNode *gn;
+			GraphNode *gn = NULL;
 			for(int i=get_child_count()-1;i>=0;i--) {
 
 				gn=get_child(i)->cast_to<GraphNode>();

tools/editor/project_settings.cpp

@@ -966,7 +966,7 @@ void ProjectSettings::_autoload_delete(Object *p_item,int p_column, int p_button
 		undo_redo->commit_action();
 	} else {
 
-		TreeItem *swap;
+		TreeItem *swap = NULL;
 
 		if (p_button==1) {
 			swap=ti->get_prev();