Remove an unnecessary null pointer check

[elfring]

An extra null pointer check is not needed in the destructor for the class "TSmartMemory".

[RafaelCintron]

Thank you for opening this issue Markus Elfring (@elfring) . I agree the null pointer check is not needed. Feel free to send a pull request with the null pointer check removed.

[Geraldjoshua]

Hi, can I request a pull with the null pointer check removed, for this issue, if it has not been fixed yet? Thank you!