Lock the address entry bucket when dumping ADB namehook

When dumping an ADB address entry associated with a name,
the name bucket lock was held, but the entry bucket lock was
not; this could cause data races when other threads were updating
address entry info. (These races are probably not operationally
harmful, but they triggered TSAN error reports.)

lib/dns/adb.c

@@ -2946,7 +2946,9 @@ print_namehook_list(FILE *f, const char *legend, dns_adb_t *adb,
 		if (debug) {
 			fprintf(f, ";\tHook(%s) %p\n", legend, nh);
 		}
+		LOCK(&nh->entry->bucket->lock);
 		dump_entry(f, adb, nh->entry, debug, now);
+		UNLOCK(&nh->entry->bucket->lock);
 	}
 }