ext4: constify xattr_handler

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ext4/xattr_user.c b/fs/ext4/xattr_user.c
index c4ce057..98c3753 100644
--- a/fs/ext4/xattr_user.c
+++ b/fs/ext4/xattr_user.c
@@ -54,7 +54,7 @@
 			      name, value, size, flags);
 }
 
-struct xattr_handler ext4_xattr_user_handler = {
+const struct xattr_handler ext4_xattr_user_handler = {
 	.prefix	= XATTR_USER_PREFIX,
 	.list	= ext4_xattr_user_list,
 	.get	= ext4_xattr_user_get,