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libauthsrv: fix _asgetresp() for passwd

--- a/sys/src/libauthsrv/_asgetresp.c

+++ b/sys/src/libauthsrv/_asgetresp.c

@@ -8,11 +8,14 @@

 	char tbuf[TICKETLEN+AUTHENTLEN];

 	int n, m;

+	m = TICKETLEN;

 	memset(t, 0, sizeof(Ticket));

-	if(a != nil)

+	if(a != nil){

+		m += AUTHENTLEN;

 		memset(a, 0, sizeof(Authenticator));

+	}

-	n = _asrdresp(fd, tbuf, sizeof(tbuf));

+	n = _asrdresp(fd, tbuf, m);

 	if(n <= 0)

 		return -1;