fix: bench: Eliminate unneeded .clone()s

Clippy insists and my pre-commit hook keeps trying to add this to random
commits.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

src/vmm/benches/queue.rs

@@ -64,7 +64,7 @@ pub fn queue_benchmark(c: &mut Criterion) {
     let desc = queue.pop().unwrap();
     c.bench_function("next_descriptor_1", |b| {
         b.iter(|| {
-            let mut head = Some(desc.clone());
+            let mut head = Some(desc);
             while let Some(d) = head {
                 head = std::hint::black_box(d.next_descriptor());
             }
@@ -76,7 +76,7 @@ pub fn queue_benchmark(c: &mut Criterion) {
     let desc = queue.pop().unwrap();
     c.bench_function("next_descriptor_2", |b| {
         b.iter(|| {
-            let mut head = Some(desc.clone());
+            let mut head = Some(desc);
             while let Some(d) = head {
                 head = std::hint::black_box(d.next_descriptor());
             }
@@ -88,7 +88,7 @@ pub fn queue_benchmark(c: &mut Criterion) {
     let desc = queue.pop().unwrap();
     c.bench_function("next_descriptor_4", |b| {
         b.iter(|| {
-            let mut head = Some(desc.clone());
+            let mut head = Some(desc);
             while let Some(d) = head {
                 head = std::hint::black_box(d.next_descriptor());
             }
@@ -100,7 +100,7 @@ pub fn queue_benchmark(c: &mut Criterion) {
     let desc = queue.pop().unwrap();
     c.bench_function("next_descriptor_16", |b| {
         b.iter(|| {
-            let mut head = Some(desc.clone());
+            let mut head = Some(desc);
             while let Some(d) = head {
                 head = std::hint::black_box(d.next_descriptor());
             }