USB: Make file operations structs in drivers/usb const.

Making structs const prevents accidental bugs and with the proper debug
options they're protected against corruption.

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index d1372cb..e345f15 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -16,7 +16,7 @@
 
 #include "uhci-hcd.h"
 
-#define uhci_debug_operations (* (struct file_operations *) NULL)
+#define uhci_debug_operations (* (const struct file_operations *) NULL)
 static struct dentry *uhci_debugfs_root;
 
 #ifdef DEBUG
@@ -500,7 +500,7 @@
 }
 
 #undef uhci_debug_operations
-static struct file_operations uhci_debug_operations = {
+static const struct file_operations uhci_debug_operations = {
 	.owner =	THIS_MODULE,
 	.open =		uhci_debug_open,
 	.llseek =	uhci_debug_lseek,