freebsd 9.2. not declared ret1 and ret2.
fix, please.

/root/osrm/Project-OSRM/Tools/io-benchmark.cpp:228:36: error: 'ret1' was not declared in this scope
/root/osrm/Project-OSRM/Tools/io-benchmark.cpp:235:27: error: 'ret2' was not declared in this scope
/root/osrm/Project-OSRM/Tools/io-benchmark.cpp:288:36: error: 'ret1' was not declared in this scope
/root/osrm/Project-OSRM/Tools/io-benchmark.cpp:295:27: error: 'ret2' was not declared in this scope