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libc: idn2utf()/utf2idn(): check for < 1 buffer, can't insert terminating NUL.

--- a/sys/src/libc/9sys/idn.c

+++ b/sys/src/libc/9sys/idn.c

@@ -191,6 +191,9 @@

 	Rune rb[Domlen], r;

 	int nc, nr, n;

+	if(nbuf < 1)

+		return -1;

+

 	cp = name;

 	dp = buf;

 	de = dp+nbuf-1;

@@ -230,6 +233,9 @@

 	char *dp, *de, *cp;

 	Rune rb[Domlen], r;

 	int nc, nr, n;

+

+	if(nbuf < 1)

+		return -1;

 	dp = buf;

 	de = dp+nbuf-1;