scsi: mpt3sas: Remove flush_scheduled_work() call

It seems to me that mpt3sas driver is using dedicated workqueues and is not
calling schedule{,_delayed}_work{,_on}(). Then, there will be no work to
flush using flush_scheduled_work().

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Tetsuo Handa <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/mpt3sas/mpt3sas_scsih.c

···
 		return rc;
 
 	mpt3sas_base_stop_watchdog(ioc);
-	flush_scheduled_work();
 	scsi_block_requests(shost);
 	_scsih_nvme_shutdown(ioc);
 	ioc_info(ioc, "pdev=0x%p, slot=%s, entering operating state\n",