PVS-Studio warning V547 for KDE4

static QString formatICalInvitationHelper(....)
{
  ....
  a = findDelegatedFromMyAttendee( inc );
  if ( a ) {
    if ( a->status() != Attendee::Accepted ||      //<==
         a->status() != Attendee::Tentative ) {    //<==
      html += responseButtons( inc, rsvpReq, rsvpRec, helper );
      break;
    }
  }
  ....
}

This suspicious code was found in KDE4 project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression is always true. Probably the '&&' operator should be used here. incidenceformatter.cpp 2684

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/