Removed unused variables

libtrellis/src/OptChipdb.cpp

diff --git a/libtrellis/src/OptChipdb.cpp b/libtrellis/src/OptChipdb.cpp
index d2904d3..56c4766 100644
--- a/libtrellis/src/OptChipdb.cpp
+++ b/libtrellis/src/OptChipdb.cpp
@@ -40,7 +40,6 @@
     }
     shared_ptr<OptimizedChipdb> cdb = make_shared<OptimizedChipdb>(IdStore(*graph));
     for (const auto &loc : graph->tiles) {
-        int x = loc.first.x, y = loc.first.y;
         LocationData ld;
         const auto &td = loc.second;
         for (const auto &bel : td.bels) {