Avoid warnings about not checking chdir() result in wxGTK.

Give error if changing directory when wxFD_CHANGE_DIR or wxDIRP_CHANGE_DIR
flags are used, this is a good idea generally speaking and it also avoids
warnings about not checking chdir() return value that we got under Ubuntu.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78480 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/filedlg.cpp

@@ -81,7 +81,10 @@ static void gtk_filedialog_ok_callback(GtkWidget *widget, wxFileDialog *dialog)
     {
         // Use chdir to not care about filename encodings
         wxGtkString folder(g_path_get_dirname(filename));
-        chdir(folder);
+        if ( chdir(folder) != 0 )
+        {
+            wxLogSysError(_("Changing current directory to \"%s\" failed"));
+        }
     }
 
     wxCommandEvent event(wxEVT_BUTTON, wxID_OK);

src/gtk/filepicker.cpp

@@ -180,7 +180,12 @@ static void file_set(GtkFileChooser* widget, wxDirButton* p)
     // thus we need to make sure the current working directory is updated if wxDIRP_CHANGE_DIR
     // style was given.
     if (p->HasFlag(wxDIRP_CHANGE_DIR))
-        chdir(filename);
+    {
+        if ( chdir(filename) != 0 )
+        {
+            wxLogSysError(_("Changing current directory to \"%s\" failed"));
+        }
+    }
 
     // ...and fire an event
     wxFileDirPickerEvent event(wxEVT_DIRPICKER_CHANGED, p, p->GetId(), p->GetPath());