kill rent calculator (#6625)

programs/bpf/rust/sysval/src/lib.rs

@@ -7,7 +7,7 @@ use solana_sdk::{
     entrypoint,
     entrypoint::SUCCESS,
     pubkey::Pubkey,
-    rent_calculator,
+    rent,
     sysvar::{
         clock::Clock, fees::Fees, rent::Rent, rewards::Rewards, slot_hashes::SlotHashes,
         stake_history::StakeHistory,
@@ -42,9 +42,8 @@ fn process_instruction(_program_id: &Pubkey, accounts: &mut [AccountInfo], _data
 
     let rent = Rent::from_account_info(&accounts[7]).unwrap();
     assert_eq!(
-        rent.rent_calculator.due(
-            rent_calculator::DEFAULT_LAMPORTS_PER_BYTE_YEAR
-                * rent_calculator::DEFAULT_EXEMPTION_THRESHOLD as u64,
+        rent.due(
+            rent::DEFAULT_LAMPORTS_PER_BYTE_YEAR * rent::DEFAULT_EXEMPTION_THRESHOLD as u64,
             1,
             1.0
         ),