message: Fix shmat() error handling in swShareMemory_sysv_create()
  "on error, (void *) -1 is returned" -- man 2 shmat
  Reference: Coverity CID
diff: @@ -157,7 +157,7 @@ void *swShareMemory_sysv_create(swShareMemory *object, int size, int key)
  swWarn("shmget() failed. Error: %s[%d]", strerror(errno), errno);
  return NULL;
  }
  - if ((mem = shmat(shmid, NULL, 0)) < 0)
  + if ((mem = shmat(shmid, NULL, 0)) == (void *) -1)
  {
  swWarn("shmat() failed. Error: %s[%d]", strerror(errno), errno);
  return NULL;
  