ensure clean and consistent "namespace" usage

- remove some missplaced ;
- ensure end of a namespace is clearly visible
- use same formatting when using namespace

src/script.cpp

@@ -974,6 +974,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
 
 
 namespace {
+
 /** Wrapper that serializes like CTransaction, but with the modifications
  *  required for the signature hash done in-place
  */
@@ -1066,7 +1067,8 @@ public:
         ::Serialize(s, txTo.nLockTime, nType, nVersion);
     }
 };
-}
+
+} // anon namespace
 
 uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
 {
@@ -1092,7 +1094,6 @@ uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsig
     return ss.GetHash();
 }
 
-
 // Valid signature cache, to avoid doing expensive ECDSA signature checking
 // twice for every transaction (once when accepted into memory pool, and
 // again when accepted into the block chain)