[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.cpp

@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "bench.h"
+
 #include "perf.h"
 
 #include <assert.h>

src/policy/policy.h

@@ -3,8 +3,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_POLICY_H
-#define BITCOIN_POLICY_H
+#ifndef BITCOIN_POLICY_POLICY_H
+#define BITCOIN_POLICY_POLICY_H
 
 #include "consensus/consensus.h"
 #include "script/interpreter.h"
@@ -59,4 +59,4 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason, const CChainParam
      */
 bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, uint32_t consensusBranchId);
 
-#endif // BITCOIN_POLICY_H
+#endif // BITCOIN_POLICY_POLICY_H