PVS-Studio warning V512 for QT

int s_attr_table[256];

void CppLexer::setupScanTable()
{
  ...
  memset(s_attr_table, 0, 256);
  ...
}

This is what should have been written here: sizeof(int) * 256


This suspicious code was found in QT project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer 's_attr_table'. qt3to4 cpplexer.cpp 77

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/