Fix buggy find_installed_xroute.
Fix buggy find_installed_xroute.

dtaht/babeld-shortrtt-metrics,woniullb/babeld,wlanslovenija/babeld,sudomesh/babeld,Gwendocg/babeldToS,tcatm/babeld,boutier/babeld,Gwendocg/babeldToS,jech/babeld,wlanslovenija/babeld,jech/babeld,Drooids/babeld