PVS-Studio warning V512 for Firefox

void Time::Explode(bool is_local, Exploded* exploded) const {
  ...
  ZeroMemory(exploded, sizeof(exploded));
  ...
}

This is what should have been written here:
ZeroMemory(exploded, sizeof(*exploded));

This suspicious code was found in Firefox project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer '(exploded)'. time_win.cc 198

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/