fix-print-dupe.diff

--- a/session.cxx
+++ b/session.cxx
@@ -2391,9 +2391,9 @@ systemtap_session::print_error (const semantic_error& se)
       seen_errors[se.errsrc_chain()]++;
       cerr << build_error_msg(se);
       for (const semantic_error *e = &se; e != NULL; e = e->get_chain())
-        if (verbose > 1 || seen_errors[e->errsrc] < 1) // dupe-eliminate chained errors too
+        if (verbose > 1 || seen_errors[e->errsrc_chain()] < 1) // dupe-eliminate chained errors too
           {
-            seen_errors[e->errsrc]++;
+            seen_errors[e->errsrc_chain()]++;
             cerr << build_error_msg(*e);
           }
     }