nupa_subcktcall(), simplify

src/frontend/numparam/xpressn.c

@@ -1654,13 +1654,13 @@ nupa_subcktcall(dico_t *dico, char *s, char * const x, char * const inst_name)
                 }
 
                 char * const u_p = spice_dstring_value(&ustr);
-                if (u_p[0]) {
+                if (*u_p) {
                     char * const idlist_p = spice_dstring_value(&idlist);
                     char *dollar = strchr(idlist_p, '$');
                     if (dollar) {
                         /* replace dollar with expression string u */
                         pscopy(&vstr, idlist_p, 0, (int) (dollar - idlist_p));
-                        sadd(&vstr, spice_dstring_value(&ustr));
+                        sadd(&vstr, u_p);
                         sadd(&vstr, dollar + 1);
                         scopyd(&idlist, &vstr);
                     }