[An extra null pointer check is not needed in functions](http://dietmar-kuehl.de/mirror/c++-faq/freestore-mgmt.html#faq-16.8) like the following. - [CTopKeySorter](https://github.com/onexsoft/onecache/blob/310b09d69ad1ff41bbdd0c81c23098b96e755454/src/top-key.cpp#L39) - [Vector::clear](https://github.com/onexsoft/onecache/blob/310b09d69ad1ff41bbdd0c81c23098b96e755454/src/util/vector.h#L86)
