PVS-Studio warning V530 for InstantVNC

struct ST_DATA
{
  ...
  std::string m_szImagePath;
  ...
};

void Install_and_Run_MainFiles(const char* szPath)
{
  ...
  if (!WriteTmpBanner(ser, szPath))
  {
    ser.m_data.m_szImagePath.empty();
  }
  ...
}

This is what should have been written here: ser.m_data.m_szImagePath.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. AskParameter wndproc.cpp 163

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/