bug fix, (#3188327), segfault in ngsconvert

ChangeLog

@@ -1,3 +1,9 @@
+2011-05-28  Robert Larice
+ * src/ngsconvert.c :
+    bug fix, (#3188327), segfault in ngsconvert
+    thanks to Ed Spittles
+    http://sourceforge.net/tracker/?func=detail&aid=3188327&group_id=38962&atid=423915
+
 2011-05-23  Holger Vogt
  * configure.ac: remove reference to devices/hisim/makefile (line 1035)
 
@@ -348,7 +354,7 @@
       currentgraph is a dynamical scoped variable
    in response to
      http://sourceforge.net/tracker/?func=detail&atid=423915&aid=3263437&group_id=38962
-   FIXME, need to be fixed for ms-windows as well
+   FIXME/DONE, need to be fixed for ms-windows as well
 
 2011-04-09  Robert Larice
  * src/spicelib/analysis/cktsens.c :

src/ngsconvert.c

@@ -437,7 +437,7 @@ void cp_pushcontrol(void) { }
 void cp_popcontrol(void) { }
 void out_init(void) { }
 void cp_doquit(void) { exit(0); }
-void cp_usrvars(struct variable **v1, struct variable **v2) { NG_IGNORE(v2); NG_IGNORE(v1); return; }
+void cp_usrvars(struct variable **v1, struct variable **v2) { *v1 = NULL; *v2 = NULL;  return; }
 int cp_evloop(char *s) { NG_IGNORE(s); return (0); }
 void cp_ccon(bool o) { NG_IGNORE(o); }
 char*if_errstring(int c) { NG_IGNORE(c); return ("error"); }