stake_pool: fix wrong available_for_withdrawal_wo_fee calculation (#2900)

* - fix wrong available_for_withdrawal_wo_fee calculation by prepare_withdraw_accounts

* - fix formatting

* - refactor

* - fix sub issue

Author: AlexanderRay

stake-pool/cli/src/main.rs

@@ -1257,15 +1257,23 @@ fn prepare_withdraw_accounts(
 
             (
                 transient_stake_account_address,
-                validator.transient_stake_lamports,
+                validator
+                    .transient_stake_lamports
+                    .saturating_sub(min_balance),
                 Some(validator.vote_account_address),
             )
         },
     ));
 
     let reserve_stake = rpc_client.get_account(&stake_pool.reserve_stake)?;
 
-    accounts.push((stake_pool.reserve_stake, reserve_stake.lamports, None));
+    accounts.push((
+        stake_pool.reserve_stake,
+        reserve_stake.lamports
+            - rpc_client.get_minimum_balance_for_rent_exemption(STAKE_STATE_LEN)?
+            - 1,
+        None,
+    ));
 
     // Prepare the list of accounts to withdraw from
     let mut withdraw_from: Vec<WithdrawAccount> = vec![];