contracts: fix types

contracts/stake/src/lib.rs

@@ -119,9 +119,9 @@ unsafe fn slash(arg_len: u32) -> u32 {
 
 #[no_mangle]
 unsafe fn hard_slash(arg_len: u32) -> u32 {
-    rusk_abi::wrap_call(arg_len, |(pk, value)| {
+    rusk_abi::wrap_call(arg_len, |(pk, value, severity)| {
         assert_external_caller();
-        STATE.hard_slash(&pk, value);
+        STATE.hard_slash(&pk, value, severity);
     })
 }
 

contracts/stake/src/state.rs

@@ -363,23 +363,23 @@ impl StakeState {
     ) {
         self.check_new_block();
 
-        let stake_info = self
+        let stake = self
             .get_stake_mut(stake_pk)
             .expect("The stake to slash should exist");
 
-        let prev_value = Some(stake_info.clone());
-
-        let stake = stake_info.amount.as_mut();
-        // This can happen if the provisioner unstake in the same block
-        if stake.is_none() {
-            return;
+        // Stake can have no amount if provisioner unstake in the same block
+        if stake.amount().is_none() {
+          return;
         }
 
+        let prev_value = Some(stake.clone());
+
         let (stake_amount, eligibility) =
             stake.amount.as_mut().expect("stake_to_exists");
 
         let severity = severity.unwrap_or(1);
         stake.hard_faults = stake.hard_faults.saturating_add(severity);
+        let hard_faults = stake.hard_faults as u64; 
 
         // The stake is shifted (aka suspended) for the rest of the current
         // epoch plus hard_faults epochs