Fix errors from rustc 1.71.0

Bug: 288268986
Test: m rust
Change-Id: If972c3856297978663642c60d162fcc504eb659d
diff --git a/keystore2/src/super_key.rs b/keystore2/src/super_key.rs
index 2e8b60f..7fc3ed4 100644
--- a/keystore2/src/super_key.rs
+++ b/keystore2/src/super_key.rs
@@ -823,7 +823,7 @@
         unlocking_sids: &[i64],
     ) {
         log::info!("Locking screen bound for user {} sids {:?}", user_id, unlocking_sids);
-        let mut entry = self.data.user_keys.entry(user_id).or_default();
+        let entry = self.data.user_keys.entry(user_id).or_default();
         if !unlocking_sids.is_empty() {
             if let (Some(aes), Some(ecdh)) = (
                 entry.screen_lock_bound.as_ref().cloned(),
@@ -899,7 +899,7 @@
         db: &mut KeystoreDB,
         user_id: UserId,
     ) -> Result<()> {
-        let mut entry = self.data.user_keys.entry(user_id).or_default();
+        let entry = self.data.user_keys.entry(user_id).or_default();
         if let Some(biometric) = entry.biometric_unlock.as_ref() {
             let (key_id_guard, key_entry) = db
                 .load_key_entry(