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ip/ppp: remove old struct

--- a/sys/src/cmd/ip/ppp/ppp.c

+++ b/sys/src/cmd/ip/ppp/ppp.c

@@ -1510,19 +1510,6 @@

 	close(fd);

 }

-enum

-{

-	Mofd=	32,

-};

-struct

-{

-	Lock;

-

-	int	fd[Mofd];

-	int	cfd[Mofd];

-	int	n;

-} old;

-

 static char*

 ipopen(PPP *ppp)

 {