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/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index 9de115d9..8c17da3 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -1517,7 +1517,7 @@
 	return single_open(file, proc_sl811h_show, PDE(inode)->data);
 }
 
-static struct file_operations proc_ops = {
+static const struct file_operations proc_ops = {
 	.open		= proc_sl811h_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,