Fix ticket #239 (missing function implementation in namespace causes crash)

http://apps.sourceforge.net/trac/cppcheck/ticket/239

src/tokenize.cpp

@@ -725,7 +725,7 @@ void Tokenizer::simplifyNamespaces()
 {
     for (Token *token = _tokens; token; token = token->next())
     {
-        while (token->str() == "namespace" &&
+        while (token && token->str() == "namespace" &&
                (!token->previous() || token->previous()->str() != "using"))
         {
             // Token is namespace and there is no "using" before it.
@@ -759,6 +759,9 @@ void Tokenizer::simplifyNamespaces()
                 return;
             }
         }
+
+        if (!token)
+            break;
     }
 }
 

test/testsimplifytokens.cpp

@@ -557,6 +557,14 @@ private:
 
             ASSERT_EQUALS(expected, sizeof_(code));
         }
+
+        {
+            const char code[] = "int a; namespace b{ }";
+
+            const std::string expected(" int a ;");
+
+            ASSERT_EQUALS(expected, sizeof_(code));
+        }
     }