Fix a small bug in etx-ff that might trigger if hello validity interval is longer than ETX-FF sample period.
Fix a small bug in etx-ff that might trigger if hello validity interval is longer than ETX-FF sample period.

zioproto/olsrd-gsoc2012,zioproto/olsrd-gsoc2012,diogomg/olsrd-binary-heap,cholin/olsrd,acinonyx/olsrd,zioproto/olsrd,diogomg/olsrd-binary-heap,zioproto/olsrd-gsoc2012,diogomg/olsrd,acinonyx/olsrd,ninuxorg/olsrd,cholin/olsrd,zioproto/olsrd,cholin/olsrd,sebkur/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,tdz/olsrd,sebkur/olsrd,tdz/olsrd,ninuxorg/olsrd,zioproto/olsrd-gsoc2012,ninuxorg/olsrd,duydb2/olsr,diogomg/olsrd,nolith/olsrd,servalproject/olsr,duydb2/olsr,sebkur/olsrd,diogomg/olsrd,zioproto/olsrd-gsoc2012,zioproto/olsrd-gsoc2012,tdz/olsrd,duydb2/olsr,servalproject/olsr,nolith/olsrd,diogomg/olsrd,diogomg/olsrd,servalproject/olsr,diogomg/olsrd,diogomg/olsrd-binary-heap,zioproto/olsrd,zioproto/olsrd,ninuxorg/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,cholin/olsrd,acinonyx/olsrd,zioproto/olsrd,servalproject/olsr,duydb2/olsr,duydb2/olsr,nolith/olsrd,tdz/olsrd,sebkur/olsrd,duydb2/olsr,diogomg/olsrd-binary-heap,acinonyx/olsrd,diogomg/olsrd-binary-heap,acinonyx/olsrd,nolith/olsrd,servalproject/olsr,sebkur/olsrd,duydb2/olsr,cholin/olsrd,duydb2/olsr,servalproject/olsr,sebkur/olsrd,nolith/olsrd,ninuxorg/olsrd