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/mon/mon_stat.c b/drivers/usb/mon/mon_stat.c
index 86ad2b3..f6d1491 100644
--- a/drivers/usb/mon/mon_stat.c
+++ b/drivers/usb/mon/mon_stat.c
@@ -62,7 +62,7 @@
 	return 0;
 }
 
-struct file_operations mon_fops_stat = {
+const struct file_operations mon_fops_stat = {
 	.owner =	THIS_MODULE,
 	.open =		mon_stat_open,
 	.llseek =	no_llseek,