Remove explicit borrow

clippy emits:

 error: the borrowed expression implements the required traits

As suggested remove the explicit borrow.

Author: tcharding

bitcoin/examples/ecdsa-psbt.rs

@@ -232,7 +232,7 @@ impl WatchOnly {
 
         let sigs: Vec<_> = psbt.inputs[0].partial_sigs.values().collect();
         let mut script_witness: Witness = Witness::new();
-        script_witness.push(&sigs[0].to_vec());
+        script_witness.push(sigs[0].to_vec());
         script_witness.push(self.input_xpub.to_pub().to_bytes());
 
         psbt.inputs[0].final_script_witness = Some(script_witness);

bitcoin/tests/bip_174.rs

@@ -453,8 +453,8 @@ fn finalize_psbt(mut psbt: Psbt) -> Psbt {
         let sigs: Vec<_> = psbt.inputs[1].partial_sigs.values().collect();
         let mut script_witness = Witness::new();
         script_witness.push([]); // Push 0x00 to the stack.
-        script_witness.push(&sigs[1].to_vec());
-        script_witness.push(&sigs[0].to_vec());
+        script_witness.push(sigs[1].to_vec());
+        script_witness.push(sigs[0].to_vec());
         script_witness.push(psbt.inputs[1].witness_script.clone().unwrap().as_bytes());
 
         script_witness

bitcoin/tests/psbt-sign-taproot.rs

@@ -62,7 +62,7 @@ fn psbt_sign_taproot() {
     let script3 = create_basic_single_sig_script(secp, sk_path[2].0); // m/86'/1'/0'/0/2
 
     // Just use one of the secret keys for the key path spend.
-    let kp = Keypair::from_seckey_str(secp, &sk_path[2].0).expect("failed to create keypair");
+    let kp = Keypair::from_seckey_str(secp, sk_path[2].0).expect("failed to create keypair");
 
     let internal_key = kp.x_only_public_key().0; // Ignore the parity.
 
@@ -119,7 +119,7 @@ fn psbt_sign_taproot() {
     // script path spend
     {
         // use private key of path "m/86'/1'/0'/0/1" as signing key
-        let kp = Keypair::from_seckey_str(secp, &sk_path[1].0).expect("failed to create keypair");
+        let kp = Keypair::from_seckey_str(secp, sk_path[1].0).expect("failed to create keypair");
         let x_only_pubkey = kp.x_only_public_key().0;
         let signing_key_path = sk_path[1].1;