5083 avoid undefined order of operations in assignments

*** 857,867 ****
          if (!queobjp)
                  return (NULL);
  
          queobjp->que_ops = &qmerge_ops;
          qfp = (struct que_data *)(queobjp+1);
!         qfp->q_tab.hd_private = qfp->q_tab.hd_private = 0;
          qfp->q_tab.hd_sync_next = qfp->q_tab.hd_async_next = NULL;
          qfp->q_tab.hd_cnt = (void *)qmerge_sync2async;
          queobjp->que_data = (opaque_t)qfp;
  
          return ((opaque_t)queobjp);
--- 857,867 ----
          if (!queobjp)
                  return (NULL);
  
          queobjp->que_ops = &qmerge_ops;
          qfp = (struct que_data *)(queobjp+1);
!         qfp->q_tab.hd_private = 0;
          qfp->q_tab.hd_sync_next = qfp->q_tab.hd_async_next = NULL;
          qfp->q_tab.hd_cnt = (void *)qmerge_sync2async;
          queobjp->que_data = (opaque_t)qfp;
  
          return ((opaque_t)queobjp);