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ndb: avoid double /net/ndb

--- a/sys/src/cmd/ndb/cs.c

+++ b/sys/src/cmd/ndb/cs.c

@@ -336,6 +336,10 @@

 	if(db == nil)

 		error("can't open network database");

+	for(netdb = db; netdb; netdb = netdb->next)

+		if(strcmp(netdb->file, netndb) == 0)

+			return;

+

 	netdb = ndbopen(netndb);

 	if(netdb != nil){

 		netdb->nohash = 1;

--- a/sys/src/cmd/ndb/dblookup.c

+++ b/sys/src/cmd/ndb/dblookup.c

@@ -72,6 +72,12 @@

 	xdb = ndbopen(dbfile);		/* /lib/ndb */

 	snprint(netdbnm, sizeof netdbnm, "%s/ndb", mntpt);

+	for(netdb = xdb; netdb; netdb = netdb->next)

+		if(strcmp(netdb->file, netdbnm) == 0){

+			db = xdb;

+			return 0;

+		}

+

 	netdb = ndbopen(netdbnm);	/* /net/ndb */

 	if(netdb)

 		netdb->nohash = 1;

-- 

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