PVS-Studio warning V501 for Firefox

nsresult PresShell::SetResolution(float aXResolution,
                                  float aYResolution)
{
  if (!(aXResolution > 0.0 && aXResolution > 0.0)) {
    return NS_ERROR_ILLEGAL_VALUE;
  }
  ...
}

This is what should have been written here: (aXResolution > 0.0 && aYResolution > 0.0)

This suspicious code was found in Firefox project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions to the left and to the right of the '&&' operator: aXResolution > 0.0 && aXResolution > 0.0 nspresshell.cpp 5114

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/