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post: remove a local variable in pdftext()

--- a/post.c

+++ b/post.c

@@ -582,7 +582,6 @@

 	/* read utf-8 and write utf-16 */

 	sbuf_str(sb, "<FEFF");		/* unicode byte order marker */

 	while (*s) {

-		int l = utf8len((unsigned char) *s);

 		int c = utf8code(s);

 		if ((c >= 0 && c <= 0xd7ff) || (c >= 0xe000 && c <= 0xffff)) {

 			sbuf_printf(sb, "%02X%02X", c >> 8, c & 0xff);

@@ -593,7 +592,7 @@

 			sbuf_printf(sb, "%02X%02X", c1 >> 8, c1 & 0xff);

 			sbuf_printf(sb, "%02X%02X", c2 >> 8, c2 & 0xff);

 		}

-		s += l;

+		s += utf8len((unsigned char) *s);

 	}

 	sbuf_chr(sb, '>');

 	return sbuf_done(sb);