Fix conditionally built tool

Author: DennisOSRM

src/tools/io-benchmark.cpp

@@ -20,9 +20,7 @@
 #include <random>
 #include <vector>
 
-namespace osrm
-{
-namespace tools
+namespace osrm::tools
 {
 
 const unsigned NUMBER_OF_ELEMENTS = 268435456;
@@ -45,8 +43,7 @@ void runStatistics(std::vector<double> &timings_vector, Statistics &stats)
         timings_vector.begin(), timings_vector.end(), timings_vector.begin(), 0.0);
     stats.dev = std::sqrt(primary_sq_sum / timings_vector.size() - (stats.mean * stats.mean));
 }
-} // namespace tools
-} // namespace osrm
+} // namespace osrm::tools
 
 boost::filesystem::path test_path;