PVS-Studio warning V581 for WebM

static vpx_codec_err_t vp8e_encode(....)
{
  vpx_codec_err_t res = VPX_CODEC_OK;

  if (!ctx->cfg.rc_target_bitrate)
    return res;

  if (!ctx->cfg.rc_target_bitrate)
    return res;
  ....
}

This suspicious code was found in WebM project by PVS-Studio static code analyzer.
Warning message is:
V581 The conditional expressions of the 'if' operators situated alongside each other are identical. Check lines: 755, 758. vp8_cx_iface.c 758

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/