fix a compile of annoying compiler warnings with elcap clang

diff --git a/libs/gtkmm2ext/bindings.cc b/libs/gtkmm2ext/bindings.cc
index 7d7d4ed0a6ee722026db4668da8b39b57ca12bfa..1d63cc097237875ad982ac71d0755c67af5da7e8 100644 (file)
--- a/libs/gtkmm2ext/bindings.cc
+++ b/libs/gtkmm2ext/bindings.cc
@@ -641,10 +641,10 @@ Bindings::add (KeyboardKey kb, Operation op, string const& action_name, XMLPrope
        KeybindingMap& kbm = get_keymap (op);
        if (group) {
                KeybindingMap::value_type new_pair = make_pair (kb, ActionInfo (action_name, group->value()));
-               kbm.insert (new_pair).first;
+               (void) kbm.insert (new_pair).first;
        } else {
                KeybindingMap::value_type new_pair = make_pair (kb, ActionInfo (action_name));
-               kbm.insert (new_pair).first;
+               (void) kbm.insert (new_pair).first;
        }
 
        if (can_save) {