PVS-Studio warning V564 for FFMpeg

static int vc1_decode_p_mb(VC1Context *v)
{
  ....
  int is_intra[6], is_coded[6];
  ....
  if (!coded_inter)
    coded_inter = !is_intra[i] & is_coded[i];
  ....
}

This suspicious code was found in FFMpeg project by PVS-Studio static code analyzer.
Warning message is:
V564 The '&' operator is applied to bool type value. You've probably forgotten to include parentheses or intended to use the '&&' operator. vc1dec.c 3675

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/