message: Fix return value of DWARFUnit::ExtractDIEsIfNeeded()
  This is a leftover regression from:
diff: @@ -192,13 +192,12 @@ bool DWARFUnit::ExtractDIEsIfNeeded() {
  ExtractDIEsEndCheck(offset);
  - if (!m_dwo_symbol_file)
  - return m_die_array.size();
  -
  + if (m_dwo_symbol_file) {
  DWARFUnit *dwo_cu = m_dwo_symbol_file->GetCompileUnit();
  - size_t dwo_die_count = dwo_cu->ExtractDIEsIfNeeded();
  - return m_die_array.size() + dwo_die_count -
  - 1; // We have 2 CU die, but we want to count it only as one
  + dwo_cu->ExtractDIEsIfNeeded();
  + }
  +
  + return true;
  }
  //--------------------------------------------------------------------------
  