PVS-Studio warning V530 for InstantVNC

bool CParseCmdLine::CheckParameter(..., std::string& rStrForSave)
{
  ...
  rStrForSave.empty();
  ...
}

This is what should have been written here: rStrForSave.clear();

This suspicious code was found in InstantVNC project by PVS-Studio static code analyzer.
Warning message is:
V530 The return value of function 'empty' is required to be utilized. miniWinVNC parsecmdline.cpp 367

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/