PVS-Studio warning V570 for CryEngineSDK

void CPlayerStateGround::OnPrePhysicsUpdate(....)
{
  ....
  modifiedSlopeNormal.z = modifiedSlopeNormal.z;
  ....
}

This suspicious code was found in CryEngineSDK project by PVS-Studio static code analyzer.
Warning message is:
V570 The 'modifiedSlopeNormal.z' variable is assigned to itself. playerstateground.cpp 227

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/