Fix the clippy issue

See rust-lang/rust-clippy#12454

vello_tests/src/lib.rs

@@ -153,7 +153,7 @@ pub fn write_png_to_file(
 ) -> Result<(), anyhow::Error> {
     let width = params.width;
     let height = params.height;
-    let mut file = File::create(&out_path)?;
+    let mut file = File::create(out_path)?;
     let mut encoder = png::Encoder::new(&mut file, width, height);
     encoder.set_color(png::ColorType::Rgba);
     encoder.set_depth(png::BitDepth::Eight);

vello_tests/src/snapshot.rs

@@ -83,6 +83,9 @@ impl Snapshot<'_> {
     }
 }
 
+/// Run a snapshot test.
+///
+/// Try and keep the width and height small, to reduce the size of committed binary data
 pub fn snapshot_test_sync(scene: Scene, params: &TestParams) -> Result<Snapshot<'_>> {
     pollster::block_on(snapshot_test(scene, params))
 }