K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2016-08-22T01:45:29.508500Z
K 7
svn:log
V 265
Improve the locking when sending user messages.

First, keep a ref count on the stcb after looking it up, as
done in the other lookup cases.
Second, before looking again at sp, ensure that it is not
freed, because the assoc is about to be freed.

MFC after: 3 days

END