ssa.c: Cosmetic formatting change

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: Cosmetic commentary change

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In ssa_downstream_dev_event, change return to break

when handling IBV_EVENT_SM_CHANGE event
for consistency

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In case of SM change, close the upstream connection only if directly connected to core node

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