Prevent crash on feature reset in gps tracker

git-svn-id: http://svn.osgeo.org/qgis/trunk@12979 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: timlinux

src/app/gps/qgsgpsinformationwidget.cpp

@@ -526,6 +526,7 @@ void QgsGPSInformationWidget::on_mBtnResetFeature_clicked( )
   if ( mpRubberBand )
   {
     delete mpRubberBand;
+    mpRubberBand = 0;
   }
   createRubberBand( );
   mCaptureList.clear();