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_security.c b/fs/ext4/xattr_security.c
index 8b145e9..9b21268 100644
--- a/fs/ext4/xattr_security.c
+++ b/fs/ext4/xattr_security.c
@@ -69,7 +69,7 @@
 	return err;
 }
 
-struct xattr_handler ext4_xattr_security_handler = {
+const struct xattr_handler ext4_xattr_security_handler = {
 	.prefix	= XATTR_SECURITY_PREFIX,
 	.list	= ext4_xattr_security_list,
 	.get	= ext4_xattr_security_get,