do_var_clauses() and do_var_group() do not return anything.

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@851 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/index.c

@@ -2284,7 +2284,7 @@ do_var_clauses(ClauseDef *c0, ClauseDef *cf, int var_group, PredEntry *ap, UInt
 
 static void
 do_var_group(GroupDef *grp, PredEntry *ap, UInt labl, int var_group, int first, int clleft, UInt nxtlbl) {
-  return do_var_clauses(grp->FirstClause, grp->LastClause, var_group, ap, labl, first, clleft, nxtlbl);
+  do_var_clauses(grp->FirstClause, grp->LastClause, var_group, ap, labl, first, clleft, nxtlbl);
 }
 
 static void