PVS-Studio warning V646 for Virtualdub

void VDDialogAudioConversionW32::RecomputeBandwidth() {
  ....
  if (IsDlgButtonChecked(mhdlg, IDC_PRECISION_NOCHANGE)) {
    if (mbSourcePrecisionKnown && mbSource16Bit)
      bps *= 2;
    else
      bps = 0;
  } if (IsDlgButtonChecked(mhdlg, IDC_PRECISION_16BIT))
    bps *= 2;
  ....
}

This suspicious code was found in Virtualdub project by PVS-Studio static code analyzer.
Warning message is:
V646 Consider inspecting the application's logic. It's possible that 'else' keyword is missing. VirtualDub optdlg.cpp 120

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/