PCI: make pci_name() take const argument

Since this function should never modify it (saves warnings when called with
const args too).

Signed-off-by: Alexey Zaytsev <zaytsev@altell.ru>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d304ddf..115fb7b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1145,7 +1145,7 @@
 /* If you want to know what to call your pci_dev, ask this function.
  * Again, it's a wrapper around the generic device.
  */
-static inline const char *pci_name(struct pci_dev *pdev)
+static inline const char *pci_name(const struct pci_dev *pdev)
 {
 	return dev_name(&pdev->dev);
 }