fix checked div error

Author: unconst

pallets/subtensor/src/coinbase/run_coinbase.rs

@@ -299,7 +299,7 @@ impl<T: Config> Pallet<T> {
             // --- 10 Calculate this nominator's share of the emission.
             let nominator_emission: I64F64 = I64F64::from_num(emission_minus_take)
                 .saturating_mul(I64F64::from_num(nominator_stake))
-                .check_div(I64F64::from_num(total_hotkey_stake))
+                .checked_div(I64F64::from_num(total_hotkey_stake))
                 .unwrap_or(I64F64::from_num(0));
 
             // --- 11 Increase the stake for the nominator.