Bail out if variable id is 0. This should be reverted when #563 has been fixed

src/checkbufferoverrun.cpp

@@ -248,6 +248,9 @@ void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], con
             else
                 continue;
 
+            /** @todo this condition should be redundant, the variable id should never be 0 for variables */
+            if (counter_varid == 0)
+                continue;
 
             if (Token::Match(tok2, "%varid% < %num% ;", counter_varid))
             {