Add sanity check for avl_delete
Add sanity check for avl_delete

diogomg/olsrd,servalproject/olsr,diogomg/olsrd-binary-heap,servalproject/olsr,duydb2/olsr,sebkur/olsrd,ninuxorg/olsrd,nolith/olsrd,diogomg/olsrd-binary-heap,ralisi/olsrd_cl_roam,diogomg/olsrd-binary-heap,servalproject/olsr,ninuxorg/olsrd,nolith/olsrd,ninuxorg/olsrd,duydb2/olsr,diogomg/olsrd,zioproto/olsrd,brabander/olsr,duydb2/olsr,cholin/olsrd,cholin/olsrd,diogomg/olsrd,ralisi/olsrd_cl_roam,zioproto/olsrd,cholin/olsrd,acinonyx/olsrd,brabander/olsr,tdz/olsrd,brabander/olsr,zioproto/olsrd,sebkur/olsrd,cholin/olsrd,diogomg/olsrd-binary-heap,ninuxorg/olsrd,servalproject/olsr,servalproject/olsr,diogomg/olsrd-binary-heap,zioproto/olsrd,ninuxorg/olsrd,duydb2/olsr,diogomg/olsrd-binary-heap,duydb2/olsr,duydb2/olsr,tdz/olsrd,diogomg/olsrd,duydb2/olsr,ralisi/olsrd_cl_roam,acinonyx/olsrd,ralisi/olsrd_cl_roam,acinonyx/olsrd,sebkur/olsrd,sebkur/olsrd,nolith/olsrd,zioproto/olsrd,diogomg/olsrd-binary-heap,sebkur/olsrd,brabander/olsr,servalproject/olsr,tdz/olsrd,diogomg/olsrd,tdz/olsrd,cholin/olsrd,acinonyx/olsrd,diogomg/olsrd,duydb2/olsr,nolith/olsrd,acinonyx/olsrd,tdz/olsrd,diogomg/olsrd,sebkur/olsrd,nolith/olsrd