xpressn.c, numparam.h: fcn del_attrib with void* argument,

required by nghash_free()

src/frontend/numparam/numparam.h

@@ -77,4 +77,4 @@ void nupa_subcktexit(tdico *dico);
 tdico *nupa_fetchinstance(void);
 char getidtype(tdico *d, char *s);
 entry *attrib(tdico *d, NGHASHPTR htable, char *t, char op);
-void del_attrib(entry *);
+void del_attrib(void *);

src/frontend/numparam/xpressn.c

@@ -445,8 +445,9 @@ attrib(tdico *dico_p, NGHASHPTR htable_p, char *t, char op)
  */
 
 void
-del_attrib(entry *entry_p)
+del_attrib(void *e_p)
 {
+    entry *entry_p = (entry*)e_p;
     if(entry_p) {
         tfree(entry_p->symbol);
         tfree(entry_p);