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awk: fix \x handling in regex

examples: /[\x30-\x39]/, /[\x30-2\x35-6\x39]/
would turn into "[\".

--- a/sys/src/cmd/awk/re.c

+++ b/sys/src/cmd/awk/re.c

@@ -287,9 +287,9 @@

 			*t++ = '\\';

 		if (c == 'x') {		/* hexadecimal goo follows */

 			c = hexstr(&p);

-			if (t < end-UTFmax)

-				t += runelen(c);

-			else overflow();

+			if (t >= end - runelen(c))

+				overflow();

+			t += runetochar(t, &c);

 			*to = t;

 			*s = p;

 			return;

-- 

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