scsi: bfa: Remove unneeded flush_workqueue()

All work currently pending will be done first by calling
destroy_workqueue(). There is no need to flush it explicitly.

Link: https://lore.kernel.org/r/20220424061845.3218774-1-ran.jianping@zte.com.cnReported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ran jianping <ran.jianping@zte.com.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/bfa/bfad_im.c

@@ -755,7 +755,6 @@ void
 bfad_destroy_workq(struct bfad_im_s *im)
 {
 	if (im && im->drv_workq) {
-		flush_workqueue(im->drv_workq);
 		destroy_workqueue(im->drv_workq);
 		im->drv_workq = NULL;
 	}