staging: lustre: obd: make echo_lock_ops const

Declare echo_lock_ops object of type cl_lock_operations as const as it
is only passed to the function cl_lock_slice_add. The corresponding
argument is of type const, so make the object const.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdecho/echo_client.c

@@ -319,7 +319,7 @@ static void echo_lock_fini(const struct lu_env *env,
 	kmem_cache_free(echo_lock_kmem, ecl);
 }
 
-static struct cl_lock_operations echo_lock_ops = {
+static const struct cl_lock_operations echo_lock_ops = {
 	.clo_fini      = echo_lock_fini,
 };