Mismatch in ref/unref for classvolumes using itself as classvolume

wb/lib/wb/src/wb_vrepwbl.cpp

@@ -309,7 +309,6 @@ int wb_vrepwbl::load( const char *fname)
     if ( ODD(sts))
       m_merep->removeDbs( &sts, mvrep);
     m_merep->addDbs( &sts, (wb_mvrep *)this);
-    m_nRef--;
   }
   return rsts;
 }

wb/lib/wb/src/wb_wnav_command.cpp

@@ -3522,6 +3522,7 @@ static int	wnav_create_func( void		*client_data,
     try {
       wb_erep *erep = *(wb_env *)wnav->wbctx;
       wb_vrepwbl *wbl = new wb_vrepwbl(erep);
+      wbl->ref();
       sts = wbl->load( filestr);
       if ( ODD(sts) || ignore)
 	wbl->createSnapshot( outstr_p);