PVS-Studio warning V519 for cmake

static char *
utf8_encode(const wchar_t *wval)
{
  ...
  p[0] = 0xfc | ((wc >> 30) & 0x01);
  p[1] = 0x80 | ((wc >> 24) & 0x3f); <<<---
  p[1] = 0x80 | ((wc >> 18) & 0x3f); <<<---
  p[2] = 0x80 | ((wc >> 12) & 0x3f);

This suspicious code was found in cmake project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'p [1]' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 272, 273. cmlibarchive archive_write_set_format_pax.c 273

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/