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upas/smtp: fix %.*s format for challenge in smtpcram()

the challenge should already be in ASCII format,
but better safe than sorry.

--- a/sys/src/cmd/upas/smtp/smtp.c

+++ b/sys/src/cmd/upas/smtp/smtp.c

@@ -474,7 +474,7 @@

 		return "cannot find user name";

 	for(i = 0; i < n; i++)

 		rbuf[i] = tolower(rbuf[i]);

-	l = snprint(ubuf, sizeof ubuf, "%s %.*s", usr, n, rbuf);

+	l = snprint(ubuf, sizeof ubuf, "%s %.*s", usr, utfnlen(rbuf, n), rbuf);

 	snprint(ebuf, sizeof ebuf, "%.*[", l, ubuf);

 	dBprint("%s\r\n", ebuf);

-- 

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