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text2post: check font index for out of range

--- a/sys/src/cmd/postscript/text2post/text2post.c

+++ b/sys/src/cmd/postscript/text2post/text2post.c

@@ -325,6 +325,11 @@

 		thischar = r & 0xff;

 		thisfont = (r>>8) & 0xff;

+		if (thisfont >= FONTABSIZE) {

+			Bprint(Bstderr, "font out of range\n");

+			exits("font");

+		}

+

 		if (line_no == 0 && char_no == 0)

 			startpage();