scsi: qla2xxx: Always wait for qlt_sess_work_fn() from qlt_stop_phase1()

Currently qlt_stop_phase1() may fail to call flush_scheduled_work(), for
list_empty() may return true as soon as qlt_sess_work_fn() called
list_del(). In order to close this race window, check list_empty() after
calling flush_scheduled_work().

If this patch causes problems, please check commit c4f135d64382
("workqueue: Wrap flush_workqueue() using a macro"). We are on the way to
remove all flush_scheduled_work() calls from the kernel.

Link: https://lore.kernel.org/r/[email protected]
Tested-by: Himanshu Madhani <[email protected]>
Reviewed-by: Himanshu Madhani <[email protected]>
Signed-off-by: Tetsuo Handa <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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