Fix ticket #258 (segmentation fault)

http://apps.sourceforge.net/trac/cppcheck/ticket/258

src/tokenize.cpp

@@ -452,9 +452,7 @@ void Tokenizer::tokenize(std::istream &code, const char FileName[])
     // Remove "volatile"
     while (Token::simpleMatch(_tokens, "volatile"))
     {
-        Token *tok = _tokens;
-        _tokens = _tokens->next();
-        delete tok;
+        _tokens->deleteThis();
     }
     for (Token *tok = _tokens; tok; tok = tok->next())
     {

test/testtokenize.cpp

@@ -130,6 +130,7 @@ private:
 
         TEST_CASE(vardecl1);
         TEST_CASE(vardecl2);
+        TEST_CASE(volatile_variables);
     }
 
 
@@ -1413,6 +1414,17 @@ private:
 
         ASSERT_EQUALS("void foo ( a , b ) unsigned int a ; unsigned int b ; { }", actual);
     }
+
+    void volatile_variables()
+    {
+        const char code[] = "volatile int a=0;\n"
+                            "volatile int b=0;\n"
+                            "volatile int c=0;\n";
+
+        const std::string actual(tokenizeAndStringify(code));
+
+        ASSERT_EQUALS("int a ; a = 0 ;\nint b ; b = 0 ;\nint c ; c = 0 ;", actual);
+    }
 };
 
 REGISTER_TEST(TestTokenizer)