[LyX/master] Initialize pointer members

[Jean-Marc Lasgouttes]

commit cdeb425451146b04c554c960e32ec34117643d40
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Sat Sep 12 22:39:50 2015 +0200

    Initialize pointer members
    
    Coverity issue 23387

diff --git a/src/frontends/qt4/GuiPrefs.cpp b/src/frontends/qt4/GuiPrefs.cpp
index c53c8d7..72e5328 100644
--- a/src/frontends/qt4/GuiPrefs.cpp
+++ b/src/frontends/qt4/GuiPrefs.cpp
@@ -2700,7 +2700,9 @@ GuiShortcutDialog::GuiShortcutDialog(QWidget * parent) : 
QDialog(parent)
 
 
 PrefShortcuts::PrefShortcuts(GuiPreferences * form)
-       : PrefModule(catEditing, N_("Shortcuts"), form)
+       : PrefModule(catEditing, N_("Shortcuts"), form),
+         editItem_(0), mathItem_(0), bufferItem_(0), layoutItem_(0),
+         systemItem_(0)
 {
        setupUi(this);