qla2xxx: Get rid of redundant qla_tgt_sess.tearing_down

The only place that sets qla_tgt_sess.tearing_down calls
target_splice_sess_cmd_list() immediately afterwards, without dropping
the lock it holds.  That function sets se_session.sess_tearing_down,
so we can get rid of the qla_target-specific flag, and in the one
place that looks at the qla_tgt_sess.tearing_down flag just test
se_session.sess_tearing_down instead.

Cc: Chad Dupuis <[email protected]>
Cc: Arun Easi <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>

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