added missing code.

src/lib/aqdiagram/placement/o_mlayout.c

@@ -94,6 +94,10 @@ AQDG_OBJECT *_matrixLayoutObject_new(AQDG_OBJECT *parent, uint32_t options, int
 
 GWENHYWFAR_CB void _freeData(void *bp, void *p)
 {
+  AQDG_OBJECT_MLAYOUT *xo;
+
+  xo=(AQDG_OBJECT_MLAYOUT*) p;
+  GWEN_FREE_OBJECT(xo);
 }