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pdf: fix removing the fixed content portion of Type 1 fonts

Reported by Nils Reuße <n.reusse@hxgn.net>.

--- a/pdf.c

+++ b/pdf.c

@@ -112,6 +112,7 @@

 			fixedcont = t1 + i;

 	*l1 = encrypted - cleartext;

 	*l2 = fixedcont ? fixedcont - cleartext : 0;

+	*l3 = fixedcont ? t1 + l - fixedcont : 0;

 	return 0;

 }

@@ -241,6 +242,7 @@

 			if (l3)

 				sbuf_cut(ffsb, l1 + l2);

 			l1 -= l3;

+			l3 = 0;

 		}

 		/* encoding file contents */

 		encodehex(sb, sbuf_buf(ffsb), sbuf_len(ffsb));