Make sure to free `message_buffer`

gm/ugm.cc

@@ -3470,6 +3470,9 @@ INT NS_DIM_PREFIX DisposeNode (GRID *theGrid, NODE *theNode)
   else
     DECNOOFNODE(theVertex);
 
+  /* free message buffer */
+  theNode->message_buffer_free();
+
   /* dispose vector and its matrices from node-vector */
   size = sizeof(NODE);
   if (NDATA_DEF_IN_GRID(theGrid)) {
@@ -3851,6 +3854,9 @@ INT NS_DIM_PREFIX DisposeElement (GRID *theGrid, ELEMENT *theElement, INT dispos
     if (DisposeVector (theGrid,EVECTOR(theElement)))
       RETURN(1);
 
+  /* free message buffer */
+  theElement->message_buffer_free();
+
   /* dispose element */
   /* give it a new tag ! (I know this is somewhat ugly) */
   tag = TAG(theElement);

parallel/dddif/handler.cc

@@ -893,6 +893,8 @@ static void NodeDestructor(DDD_OBJ obj)
 {
   NODE *node      = (NODE *) obj;
 
+  node->message_buffer_free();
+
   PRINTDEBUG(dddif,2,(PFMT " NodeDestructor(): n=" ID_FMTX " NDOBJ=%d\n",
                       me,ID_PRTX(node),OBJT(node)))
 }
@@ -901,6 +903,8 @@ static void NodeObjInit(DDD_OBJ obj)
 {
   NODE *node      = (NODE *) obj;
 
+  node->message_buffer(nullptr, 0);
+
   PRINTDEBUG(dddif,2,(PFMT " NodeObjInit(): n=" ID_FMTX " NDOBJ=%d\n",
                       me,ID_PRTX(node),OBJT(node)))
 }
@@ -1197,6 +1201,8 @@ static void ElementLDataConstructor (DDD_OBJ obj)
   INT prio            = EPRIO(pe);
   void    *q;
 
+  pe->message_buffer(nullptr, 0);
+
   PRINTDEBUG(dddif,2,(PFMT " ElementLDataConsX(): pe=" EID_FMTX
                       " EOBJ=%d l=%d\n",me,EID_PRTX(pe),OBJT(pe),level))