mkdir race condition

There is race condition in creating directory when multiple exes with
omniORB is starting.
mkdir() can return EEXIST errno when directory exists and it is not error -
other instance of omniORB already created directory.

Fix in comment in file
"omniORB/src/lib/omniORB/orbcore/unix/unixTransportImpl.cc":

else {
  if (mkdir(param,0755) < 0) { // <<< should be "mkdir(param,0755) < 0 &&
errno != EEXIST)"
if (omniORB::trace(1)) {
  omniORB::logger log;
  log << "Error: cannot create directory: " << param << "\n";
}
return 0;
  }
}

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