6151 use NULL setpagesize segop as a shorthand for ENOTSUP

*** 480,496 ****
      struct page ***ppp, enum lock_type type, enum seg_rw rw)
  {
          return (ENOTSUP);
  }
  
- /*ARGSUSED*/
- static int
- segmf_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc)
- {
-         return (ENOTSUP);
- }
- 
  static int
  segmf_getmemid(struct seg *seg, caddr_t addr, memid_t *memid)
  {
          struct segmf_data *data = seg->s_data;
  
--- 480,489 ----
*** 760,767 ****
          .gettype        = segmf_gettype,
          .getvp          = segmf_getvp,
          .advise         = segmf_advise,
          .dump           = segmf_dump,
          .pagelock       = segmf_pagelock,
-         .setpagesize    = segmf_setpagesize,
          .getmemid       = segmf_getmemid,
  };
--- 753,759 ----