PVS-Studio warning V547 for TortoiseGIT

enum git_ack_status {
  GIT_ACK_NONE,
  GIT_ACK_CONTINUE,
  GIT_ACK_COMMON,
  GIT_ACK_READY
};

static int wait_while_ack(gitno_buffer *buf)
{
  ....
  if (pkt->type == GIT_PKT_ACK &&
      (pkt->status != GIT_ACK_CONTINUE ||
       pkt->status != GIT_ACK_COMMON)) {
  ....
}

This suspicious code was found in TortoiseGIT project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression is always true. Probably the '&&' operator should be used here. smart_protocol.c 264

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/