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6151 use NULL setpagesize segop as a shorthand for ENOTSUP

@@ -1975,10 +1975,13 @@
 }
 
 int
 segop_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc)
 {
+        if (seg->s_ops->setpagesize == NULL)
+                return (ENOTSUP);
+
         return (seg->s_ops->setpagesize(seg, addr, len, szc));
 }
 
 int
 segop_getmemid(struct seg *seg, caddr_t addr, memid_t *mp)