PVS-Studio warning V501 for samba

static bool samu_correct(struct samu *s1, struct samu *s2)
{
  ....
  } else if (s1_len != s1_len) {
    DEBUG(0, ("Password history not written correctly, "
              "lengths differ, want %d, got %d\n",
          s1_len, s2_len));
    ret = False;
  }
  ....
}

This suspicious code was found in samba project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions to the left and to the right of the '!=' operator: s1_len != s1_len pdbtest.c 106

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/