PVS-Studio warning V614 for apr

static int warrsztoastr(const char * const * *retarr,
                        const wchar_t * arrsz, int args)
{
  const apr_wchar_t *wch;
  ....
  if (args < 0) {
    for (args = 1, wch = arrsz; wch[0] || wch[1]; ++wch)
      if (!*wch)
        ++args;
  }
  wsize = 1 + wch - arrsz;
  ....
}

This suspicious code was found in apr project by PVS-Studio static code analyzer.
Warning message is:
V614 Potentially uninitialized pointer 'wch' used. libapr start.c 58

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/