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awk: handle bad/incomplete input in maketab (thanks kenji arisawa)

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

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

@@ -133,8 +133,8 @@

 	i = 0;

 	while ((buf = Brdline(fp, '\n')) != nil) {

 		buf[Blinelen(fp)-1] = '\0';

-		tokenize(buf, toks, 3);

-		if (toks[0] == nil || strcmp("#define", toks[0]) != 0)	/* not a valid #define */

+		if (tokenize(buf, toks, 3) != 3

+		|| strcmp("#define", toks[0]) != 0)	/* not a valid #define */

 			continue;

 		tok = strtol(toks[2], nil, 10);

 		if (tok < FIRSTTOKEN || tok > LASTTOKEN) {