There is a race between ULP threads doing an accept/reject, and the
ingress processing thread handling close/abort for the same connection.
The accept/reject path needs to hold the lock to serialize these paths.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>

[ Fold in locking fix found by Dan Carpenter <dan.carpenter@oracle.com>.
  - Roland ]
Signed-off-by: NRoland Dreier <roland@purestorage.com>