use index provided in GenesisIdty

pallets/identity/src/lib.rs

@@ -157,7 +157,7 @@ pub mod pallet {
             identities.sort_unstable_by(|a, b| a.index.cmp(&b.index));
 
             for idty in identities.into_iter() {
-                let idty_index = Pallet::<T>::get_next_idty_index();
+                let idty_index = idty.index;
                 if idty.value.removable_on > T::BlockNumber::zero() {
                     <IdentitiesRemovableOn<T>>::append(
                         idty.value.removable_on,