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6152 use NULL dump segop as a shorthand for no-op

@@ -1962,10 +1962,13 @@
 }
 
 void
 segop_dump(struct seg *seg)
 {
+        if (seg->s_ops->dump == NULL)
+                return;
+
         seg->s_ops->dump(seg);
 }
 
 int
 segop_pagelock(struct seg *seg, caddr_t addr, size_t len, struct page ***page,