Fix compression regression introduced in commit 0c7b411

When adding support for multi fragments, we started to read and
use length from fast path packet. However a packet can be
compressed and uncompressed length should be used instead.

Fix issue #185

rdp5.c

@@ -119,6 +119,7 @@ process_ts_fp_updates(STREAM s)
 			ns->p = ns->data;
 			ns->rdp_hdr = ns->p;
 
+			length = rlen;
 			ts = ns;
 		}
 		else