SDP: BUG1348 - sockets are left in CLOSE state with ref count > 0

SDP: BUG1348 - sockets are left in CLOSE state with ref count > 0

Removed unnecessary sock_hold() when a CM_REJECT arrives before TCP_ESTABLISHED state.
This happend in the server side when after getting CM_REQ and answering with CM_REP a CM_REJ
arrived.
The sock_hold that was removed assumed that there will be a timewait state - but according to
the spec, the state changes back to LISTEN without TIMEWAIT.

Signed-off-by: Amir Vadai <amirv@mellanox.co.il>