[glom] cppcheck: Reduce scope of variables.

[Murray Cumming <murrayc src gnome org>]

commit 067c3a7e13619993ffc859f661daf71ad471c884
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Oct 30 10:11:16 2015 +0100

    cppcheck: Reduce scope of variables.

 glom/appwindow.cc              |    5 ++---
 glom/dialog_existing_or_new.cc |    3 +--
 glom/frame_glom.cc             |    3 ++-
 3 files changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/glom/appwindow.cc b/glom/appwindow.cc
index 043c2a9..5f3197f 100644
--- a/glom/appwindow.cc
+++ b/glom/appwindow.cc
@@ -2534,11 +2534,10 @@ void AppWindow::document_history_add(const Glib::ustring& file_uri)
   if(file_uri.empty())
     return;
 
-  bool prevent = false;
   if(!file_uri.empty())
   {
-    prevent = (file_uri == m_example_uri);
-    if(prevent)
+    //Prevent saving of example file templates just because we opened them:
+    if(file_uri == m_example_uri);
       return;
   }
 
diff --git a/glom/dialog_existing_or_new.cc b/glom/dialog_existing_or_new.cc
index a9892cc..326206a 100644
--- a/glom/dialog_existing_or_new.cc
+++ b/glom/dialog_existing_or_new.cc
@@ -258,10 +258,9 @@ bool Dialog_ExistingOrNew::list_examples()
 {
   //std::cout << "debug: " << G_STRFUNC << ": path=" << path << std::endl;
 
-  const char* examples_dir = "/org/gnome/glom/examples/";
-
   try
   {
+    const char* examples_dir = "/org/gnome/glom/examples/";
     const auto examples = Gio::Resource::enumerate_children_global(examples_dir);
     
     bool example_found = false;
diff --git a/glom/frame_glom.cc b/glom/frame_glom.cc
index bca56a2..519fe42 100644
--- a/glom/frame_glom.cc
+++ b/glom/frame_glom.cc
@@ -1130,9 +1130,10 @@ void Frame_Glom::on_dialog_add_related_table_response(int response)
 
   m_dialog_addrelatedtable->hide();
 
-  bool stop_trying = false;
   if(response == Gtk::RESPONSE_OK)
   {
+    bool stop_trying = false;
+
     Glib::ustring table_name, relationship_name, from_key_name;
     m_dialog_addrelatedtable->get_input(table_name, relationship_name, from_key_name);