PVS-Studio warning V560 for libmng

mng_retcode mng_promote_idx8_rgb16 (mng_datap pData)
{
  ....
  *(pDstline+1)   = (mng_uint8)(iR && 0xFF);
  *(pDstline+2)   = (mng_uint8)(iG >> 8);
  *(pDstline+3)   = (mng_uint8)(iG && 0xFF);
  *(pDstline+4)   = (mng_uint8)(iB >> 8);
  *(pDstline+5)   = (mng_uint8)(iB && 0xFF);
  ....
}

This suspicious code was found in libmng project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: 0xFF. libmng_pixels.c 15540

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/