For unsetup de-allocate the memory

that has been allocated locally in the code model during INIT

src/xspice/mif/mifsetup.c

@@ -532,6 +532,22 @@ MIFunsetup(GENmodel *inModel,CKTcircuit *ckt)
             tfree(here->state);
             tfree(here->conv);
             tfree(here->intgr);
+
+            /* de-allocate the memory that has been allocated locally in the code model during INIT */
+            if (here->callback) {
+                Mif_Private_t cm_data;
+                /* Prepare the structure to be passed to the code model */
+                cm_data.num_conn = here->num_conn;
+                cm_data.conn = here->conn;
+                cm_data.num_param = here->num_param;
+                cm_data.param = here->param;
+                cm_data.num_inst_var = here->num_inst_var;
+                cm_data.inst_var = here->inst_var;
+                cm_data.callback = &(here->callback);
+
+                here->callback(&cm_data, MIF_CB_DESTROY);
+            }
+
             here->initialized = MIF_FALSE;
         } /* end for all instances */
     }