used by js_post_msg() (the JS bbs.post_msg() method when used with the
reply_header object argument) - the private data attached to a message
header object is of type privatemsg_t, not private_t. This caused the
dereferences of and assignments to p->smb_result in parse_header_object()
to corrupt the privatemsg_t->msg memory causing heap corruption (caught
on Windows debug builds in js_get_msg_header_finalize()) and stack faults
(caught on Linux-gcc in parse_recipient_object()). This one was hard to
find. <whew!>