tc_set: remove unused variable
tc_set: remove unused variable

src/tc_set.c:421:17: warning: variable ‘old’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Ferry Huberts <1f083df4a0371a8eba2ce71fc6b0e214b2551710@mindef.nl>

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