6149 use NULL capable segop as a shorthand for no-capabilities

@@ -497,17 +497,10 @@
         memid->val[0] = (uintptr_t)VTOCVP(data->vp);
         memid->val[1] = (uintptr_t)seg_page(seg, addr);
         return (0);
 }
 
-/*ARGSUSED*/
-static int
-segmf_capable(struct seg *seg, segcapability_t capability)
-{
-        return (0);
-}
-
 /*
  * Add a set of contiguous foreign MFNs to the segment. soft-locking them.  The
  * pre-faulting is necessary due to live migration; in particular we must
  * return an error in response to IOCTL_PRIVCMD_MMAPBATCH rather than faulting
  * later on a bad MFN.  Whilst this isn't necessary for the other MMAP

@@ -769,7 +762,6 @@
         .advise         = segmf_advise,
         .dump           = segmf_dump,
         .pagelock       = segmf_pagelock,
         .setpagesize    = segmf_setpagesize,
         .getmemid       = segmf_getmemid,
-        .capable        = segmf_capable,
 };