instead of empty().
* src/misc/bddalloc.cc (bdd_allocator::extend): Use empty() rather
than size() when checking emptiness of lists.
* src/tgbaalgos/reductgba_sim_del.cc, src/tgbaalgos/minimalce.cc,
src/ltlvisit/basicreduce.cc, src/ltlvisit/reduce.cc,
src/tgbaalgos/gtec/ce.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/misc/minato.cc: Likewise.
* src/ltlast/multop.cc (multop::instance): Call ->size() only once.