Plug a memory leak in transmission line cpl

src/spicelib/devices/cpl/cplext.h

@@ -11,3 +11,4 @@ extern int CPLmParam(int,IFvalue*, GENmodel*);
 extern int CPLparam(int,IFvalue*, GENinstance*, IFvalue*);
 extern int CPLsetup(SMPmatrix*, GENmodel*, CKTcircuit*, int*);
 extern int CPLunsetup(GENmodel*, CKTcircuit*);
+extern int CPLdevDelete(GENinstance*);

src/spicelib/devices/cpl/cplinit.c

@@ -44,7 +44,7 @@ SPICEdev CPLinfo = {
     .DEVaccept = NULL,
     .DEVdestroy = NULL,
     .DEVmodDelete = NULL,
-    .DEVdelete = NULL,
+    .DEVdelete = CPLdevDelete,
     .DEVsetic = NULL,
     .DEVask = CPLask,
     .DEVmodAsk = CPLmAsk,

src/spicelib/devices/cpl/cplsetup.c

@@ -2146,3 +2146,21 @@ static int rotate(int dim_in, int p, int q)
 
 }
 
+int
+CPLdevDelete(GENinstance* inst)
+{
+    VI_list* tmplist, * prevlist;
+    CPLinstance* here = (CPLinstance*)inst;
+    if (here->cplines2)
+        tfree(here->cplines2);
+    if (here->cplines) {
+        prevlist = tmplist = here->cplines->vi_head;
+        while (tmplist) {
+            tmplist = tmplist->next;
+            tfree(prevlist);
+            prevlist = tmplist;
+        }
+        tfree(here->cplines);
+    }
+    return OK;
+}