Handle decoding of one CMS structure inside another.  Plain data as the
top-level item in a message needs work.

diff -ur ./mozilla/security/nss/lib/smime/cmsdecode.c ./mozilla/security/nss/lib/smime/cmsdecode.c
--- ./mozilla/security/nss/lib/smime/cmsdecode.c	2010-12-23 13:03:41.000000000 -0500
+++ ./mozilla/security/nss/lib/smime/cmsdecode.c	2011-01-12 15:22:22.245908999 -0500
@@ -307,6 +307,9 @@
     if (childp7dcx->content.pointer == NULL)
 	goto loser;
 
+    /* give the parent a copy of the pointer so that it doesn't get lost */
+    cinfo->content.pointer = childp7dcx->content.pointer;
+
     /* start the child decoder */
     childp7dcx->dcx = SEC_ASN1DecoderStart(poolp, childp7dcx->content.pointer, 
                                            template);