[Trivial] ensure minimal header conventions

- ensure header namespaces and end comments are correct
- add missing header end comments
- ensure minimal formatting (add newlines etc.)

src/bench/bench.h

@@ -1,8 +1,16 @@
 // Copyright (c) 2015 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
-#ifndef BITCOIN_BENCH_H
-#define BITCOIN_BENCH_H
+
+#ifndef BITCOIN_BENCH_BENCH_H
+#define BITCOIN_BENCH_BENCH_H
+
+#include <map>
+#include <string>
+
+#include <boost/function.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/stringize.hpp>
 
 // Simple micro-benchmarking framework; API mostly matches a subset of the Google Benchmark
 // framework (see https://github.com/google/benchmark)
@@ -25,14 +33,7 @@ static void CODE_TO_TIME(benchmark::State& state)
 BENCHMARK(CODE_TO_TIME);
 
  */
-
-
-#include <boost/function.hpp>
-#include <boost/preprocessor/cat.hpp>
-#include <boost/preprocessor/stringize.hpp>
-#include <map>
-#include <string>
-
+ 
 namespace benchmark {
 
     class State {
@@ -68,4 +69,4 @@ namespace benchmark {
 #define BENCHMARK(n) \
     benchmark::BenchRunner BOOST_PP_CAT(bench_, BOOST_PP_CAT(__LINE__, n))(BOOST_PP_STRINGIZE(n), n);
 
-#endif // BITCOIN_BENCH_H
+#endif // BITCOIN_BENCH_BENCH_H