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

*** 1962,1971 **** --- 1962,1974 ---- } 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,