ssa.c: Cosmetic formatting change in ssa_downstream_svc_server

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: Validate socket before calling ssa_send_db_update_ready

in 2 places and log message if socket is not valid

Signed-off-by: Hal Rosenstock <hal@mellanox.com>