Remove unnecessary explicit reference

Shoosh the linter, remove the unneeded `&`.

Author: tcharding

bitcoin/examples/ecdsa-psbt.rs

@@ -238,7 +238,7 @@ 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/src/blockdata/witness.rs

@@ -510,7 +510,7 @@ mod test {
         assert_eq!(witness.nth(1), None);
         assert_eq!(witness.nth(2), None);
         assert_eq!(witness.nth(3), None);
-        witness.push(&vec![0u8]);
+        witness.push(vec![0u8]);
         let expected = Witness {
             witness_elements: 1,
             content: append_u32_vec(vec![1u8, 0], &[0]),
@@ -524,7 +524,7 @@ mod test {
         assert_eq!(witness.nth(2), None);
         assert_eq!(witness.nth(3), None);
         assert_eq!(&witness[0], &[0u8][..]);
-        witness.push(&vec![2u8, 3u8]);
+        witness.push(vec![2u8, 3u8]);
         let expected = Witness {
             witness_elements: 2,
             content: append_u32_vec(vec![1u8, 0, 2, 2, 3], &[0, 2]),
@@ -539,7 +539,7 @@ mod test {
         assert_eq!(witness.nth(3), None);
         assert_eq!(&witness[0], &[0u8][..]);
         assert_eq!(&witness[1], &[2u8, 3u8][..]);
-        witness.push(&vec![4u8, 5u8]);
+        witness.push(vec![4u8, 5u8]);
         let expected = Witness {
             witness_elements: 3,
             content: append_u32_vec(vec![1u8, 0, 2, 2, 3, 2, 4, 5], &[0, 2, 5]),
@@ -563,7 +563,7 @@ mod test {
         let mut witness = Witness::default();
         for i in 0..5 {
             assert_eq!(witness.iter().len(), i);
-            witness.push(&vec![0u8]);
+            witness.push(vec![0u8]);
         }
         let mut iter = witness.iter();
         for i in (0..=5).rev() {

bitcoin/tests/psbt.rs

@@ -454,8 +454,8 @@ 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