scsi: message: fusion: Remove unused sas_persist_task work

MPT_ADAPTER->sas_persist_task is no longer used since commit 3eb0822c
("[SCSI] mpt fusion: Firmware event implementation using seperate
WorkQueue").

Link: https://lore.kernel.org/r/b2ca2164-5347-8ec1-d8b6-3225df864173@I-love.SAKURA.ne.jpSigned-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/message/fusion/mptbase.h

@@ -757,7 +757,6 @@ typedef struct _MPT_ADAPTER
 	u8			 wait_on_reset_completion;
 	MPT_SCHEDULE_TARGET_RESET schedule_target_reset;
 	MPT_FLUSH_RUNNING_CMDS schedule_dead_ioc_flush_running_cmds;
-	struct work_struct	 sas_persist_task;
 
 	struct work_struct	 fc_setup_reset_work;
 	struct list_head	 fc_rports;