const: constify remaining dev_pm_ops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index d8b43ae..bbe2b92 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -330,7 +330,7 @@
 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 
 #ifdef CONFIG_PM_SLEEP
-extern struct dev_pm_ops	usb_hcd_pci_pm_ops;
+extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 #endif
 #endif /* CONFIG_PCI */