scsi: lpfc: Correct panics with eh_timeout and eh_deadline

scsi: lpfc: Correct panics with eh_timeout and eh_deadline

Orabug: 25486030

Correct panics with eh_timeout and eh_deadline

We were having double completions on our SLI-3 version of adapters.
Solved by clearing our command pointer before calling scsi_done.

The eh paths potentially ran simulatenously and would see the non-null
value and invoke scsi_done again.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 89533e9be08aeda5cdc4600d46c1540c7b440299)
Signed-off-by: Brian Maly <brian.maly@oracle.com>