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telnetd: fix getremote()

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

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

@@ -66,12 +66,14 @@

 	int fd, n;

 	char remfile[Maxpath];

-	sprint(remfile, "%s/remote", dir);

+	snprint(remfile, sizeof(remfile), "%s/remote", dir);

 	fd = open(remfile, OREAD);

-	if(fd < 0)

-		strcpy(remotesys, "unknown2");

+	if(fd < 0){

+		strcpy(remotesys, remfile);

+		return;

+	}

 	n = read(fd, remotesys, sizeof(remotesys)-1);

-	if(n>0)

+	if(n > 0)

 		remotesys[n-1] = 0;

 	else

 		strcpy(remotesys, remfile);

-- 

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