scsi: sr: constify sr_pm_ops structure

sr_pm_ops, of type struct dev_pm_ops, is never modified, so declare it
as const.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index ed17934..bed2bbd 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -83,7 +83,7 @@
 static int sr_done(struct scsi_cmnd *);
 static int sr_runtime_suspend(struct device *dev);
 
-static struct dev_pm_ops sr_pm_ops = {
+static const struct dev_pm_ops sr_pm_ops = {
 	.runtime_suspend	= sr_runtime_suspend,
 };