PVS-Studio warning V517 for WebRTC

ACMGenericCodec* ACMCodecDB::CreateCodecInstance(....) {
  ....
  } else if (!STR_CASE_CMP(codec_inst->plname, "CN")) {
    int codec_id;
    switch (codec_inst->plfreq) {
      ....
  } else if ....
  ....
  } else if (!STR_CASE_CMP(codec_inst->plname, "CN")) {
    int codec_id;
    switch (codec_inst->plfreq) {
  ....
}

This suspicious code was found in WebRTC project by PVS-Studio static code analyzer.
Warning message is:
V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 680, 735. acm_codec_database.cc 680

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/