Fix clippy lints.

src/rust/bin/inspect/block.rs

@@ -186,8 +186,8 @@ impl Block {
                     mutated = true;
                 }
                 let mut inner_hasher = Sha256::new();
-                inner_hasher.update(&merkle_tree[j + i]);
-                inner_hasher.update(&merkle_tree[j + i2]);
+                inner_hasher.update(merkle_tree[j + i]);
+                inner_hasher.update(merkle_tree[j + i2]);
                 merkle_tree.push(Sha256::digest(&inner_hasher.finalize()));
                 i += 2;
             }

src/rust/src/builder_ffi.rs

@@ -171,7 +171,7 @@ pub extern "C" fn orchard_unauthorized_bundle_prove_and_sign(
     let mut rng = OsRng;
     let res = bundle
         .create_proof(pk, &mut rng)
-        .and_then(|b| b.apply_signatures(&mut rng, *sighash, &signing_keys));
+        .and_then(|b| b.apply_signatures(rng, *sighash, &signing_keys));
 
     match res {
         Ok(signed) => Box::into_raw(Box::new(signed)),

src/rust/src/incremental_merkle_tree.rs

@@ -17,7 +17,7 @@ use zcash_primitives::merkle_tree::{
 
 pub fn write_checkpoint_v2<W: Write>(mut writer: W, checkpoint: &Checkpoint) -> io::Result<()> {
     write_usize_leu64(&mut writer, checkpoint.bridges_len())?;
-    writer.write_u8(if checkpoint.is_witnessed() { 1 } else { 0 })?;
+    writer.write_u8(u8::from(checkpoint.is_witnessed()))?;
     Vector::write_sized(&mut writer, checkpoint.witnessed().iter(), |w, p| {
         write_position(w, *p)
     })?;

src/rust/src/metrics_ffi.rs

@@ -28,7 +28,7 @@ pub extern "C" fn metrics_run(
         }
     };
     // We always allow localhost.
-    allow_ips.extend(&["127.0.0.0/8", "::1/128"]);
+    allow_ips.extend(["127.0.0.0/8", "::1/128"]);
 
     // Parse the address to bind to.
     let bind_address = SocketAddr::new(