Fix cargo clippy and fmt

Change-Id: I94b32c9e2978691fdfa70b58432fffd501e0ba90
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/62885
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

rust/bssl-crypto/src/digest.rs

diff --git a/rust/bssl-crypto/src/digest.rs b/rust/bssl-crypto/src/digest.rs
index aa6355d..7240297 100644
--- a/rust/bssl-crypto/src/digest.rs
+++ b/rust/bssl-crypto/src/digest.rs
@@ -15,7 +15,7 @@
 
 use core::marker::PhantomData;
 
-use crate::{ForeignTypeRef, CSlice};
+use crate::{CSlice, ForeignTypeRef};
 
 /// The SHA-256 digest algorithm.
 #[derive(Clone)]
@@ -86,7 +86,6 @@
 pub struct Digest<M: Md, const OUTPUT_SIZE: usize>(bssl_sys::EVP_MD_CTX, PhantomData<M>);
 
 impl<M: Md, const OUTPUT_SIZE: usize> Digest<M, OUTPUT_SIZE> {
-
     /// Creates a new Digest from the given `Md` type parameter.
     ///
     /// Panics:

rust/bssl-crypto/src/hkdf.rs

diff --git a/rust/bssl-crypto/src/hkdf.rs b/rust/bssl-crypto/src/hkdf.rs
index d314495..efd569b 100644
--- a/rust/bssl-crypto/src/hkdf.rs
+++ b/rust/bssl-crypto/src/hkdf.rs
@@ -45,7 +45,7 @@
         Self {
             salt: salt.map(Vec::from),
             ikm: Vec::from(ikm),
-            _marker: PhantomData::default(),
+            _marker: PhantomData,
         }
     }