scsi: qla2xxx: Make qla2x00_abort_srb() again decrease the sp reference count

Since qla2x00_abort_srb() starts with increasing the reference count of
@sp, decrease that same reference count before returning.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Fixes: 219d27d7 ("scsi: qla2xxx: Fix race conditions in the code for aborting SCSI commands") # v5.2.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Himanshu Madhani <hmadhani@marvell.com>
Reviewed-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_os.c

@@ -1755,6 +1755,8 @@ static void qla2x00_abort_srb(struct qla_qpair *qp, srb_t *sp, const int res,
 		spin_lock_irqsave(qp->qp_lock_ptr, *flags);
 		sp->comp = NULL;
 	}
+
+	atomic_dec(&sp->ref_count);
 }
 
 static void