use NULL capable segop as a shorthand for no-capabilities
Instead of forcing every segment driver to implement a dummy "return 0"
function, handle NULL capable segop function pointer as "no copabilities
supported" shorthand.

@@ -92,11 +92,10 @@
                         size_t len, struct segkp_data *kpd, uint_t flags);
 static int      segkp_load(struct hat *hat, struct seg *seg, caddr_t vaddr,
                         size_t len, struct segkp_data *kpd, uint_t flags);
 static struct   segkp_data *segkp_find(struct seg *seg, caddr_t vaddr);
 static int      segkp_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp);
-static int      segkp_capable(struct seg *seg, segcapability_t capability);
 
 /*
  * Lock used to protect the hash table(s) and caches.
  */
 static kmutex_t segkp_lock;

@@ -145,11 +144,10 @@
         .checkprot      = segkp_checkprot,
         .kluster        = segkp_kluster,
         .dump           = segkp_dump,
         .pagelock       = segkp_pagelock,
         .getmemid       = segkp_getmemid,
-        .capable        = segkp_capable,
 };
 
 
 static void segkpinit_mem_config(struct seg *);
 

@@ -1368,17 +1366,10 @@
 segkp_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp)
 {
         return (ENODEV);
 }
 
-/*ARGSUSED*/
-static int
-segkp_capable(struct seg *seg, segcapability_t capability)
-{
-        return (0);
-}
-
 #include <sys/mem_config.h>
 
 /*ARGSUSED*/
 static void
 segkp_mem_config_post_add(void *arg, pgcnt_t delta_pages)