firewire: make PCI device id constant

The id_table field of the struct pci_driver is constant in <linux/pci.h>
so it is worth to make pci_table also constant.  Found with Coccinelle.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Cc: Julia Lawall <julia@diku.dk>
Cc: cocci@diku.dk
Signed-off-by: Stefan Richter stefanr@s5r6.in-berlin.de> (changelog)
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index a61571c..6610d2d3 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2657,7 +2657,7 @@
 }
 #endif
 
-static struct pci_device_id pci_table[] = {
+static const struct pci_device_id pci_table[] = {
 	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_FIREWIRE_OHCI, ~0) },
 	{ }
 };