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create bio file (/adm/keys.who) if it doesnt exist

--- a/sys/src/cmd/auth/lib/wrbio.c

+++ b/sys/src/cmd/auth/lib/wrbio.c

@@ -11,8 +11,11 @@

 	int i, fd, n;

 	fd = open(file, OWRITE);

-	if(fd < 0)

-		error("can't open %s", file);

+	if(fd < 0){

+		fd = create(file, OWRITE, 0660);

+		if(fd < 0)

+			error("can't create %s", file);

+	}

 	if(seek(fd, 0, 2) < 0)

 		error("can't seek %s", file);

-- 

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