Merge Gtk event log fix from 'pre-0.64'.

diff --combined unix/gtkdlg.c
index dc1e31b1bafa219f87edeab5e2d13aeb36aba4ee,8e1364bd349d8cc19379429b2d1f94a7f90aab1b..ffdf3236b2e10e5c4e0496e4f206961294e6b0d3
--- 1/unix/gtkdlg.c
--- 2/unix/gtkdlg.c
+++ b/unix/gtkdlg.c
@@@ -3444,7 -3444,7 +3444,7 @@@ static void licence_clicked(GtkButton *
        "Portions copyright Robert de Bath, Joris van Rantwijk, Delian "
        "Delchev, Andreas Schultz, Jeroen Massar, Wez Furlong, Nicolas "
        "Barry, Justin Bradford, Ben Harris, Malcolm Smith, Ahmad Khalifa, "
 -      "Markus Kuhn, Colin Watson, and CORE SDI S.A.\n\n"
 +      "Markus Kuhn, Colin Watson, Christopher Staite, and CORE SDI S.A.\n\n"
  
        "Permission is hereby granted, free of charge, to any person "
        "obtaining a copy of this software and associated documentation "
@@@ -3550,6 -3550,7 +3550,7 @@@ static void eventlog_destroy(GtkWidget 
  
      es->window = NULL;
      sfree(es->seldata);
+     es->seldata = NULL;
      dlg_cleanup(&es->dp);
      ctrl_free_box(es->eventbox);
  }