Fix some new clippy lints

src/model/helper/bucket.rs

@@ -30,8 +30,7 @@ impl<'a> BucketHelper<'a> {
 		// the AWS spec, and hex-encoded UUIDs are 64 chars long.
 		let hexbucket = hex::decode(bucket_name.as_str())
 			.ok()
-			.map(|by| Uuid::try_from(&by))
-			.flatten();
+			.and_then(|by| Uuid::try_from(&by));
 		if let Some(bucket_id) = hexbucket {
 			Ok(self
 				.0
@@ -46,8 +45,7 @@ impl<'a> BucketHelper<'a> {
 				.bucket_alias_table
 				.get(&EmptyKey, bucket_name)
 				.await?
-				.map(|x| *x.state.get())
-				.flatten())
+				.and_then(|x| *x.state.get()))
 		}
 	}
 

src/model/key_table.rs

@@ -106,8 +106,7 @@ impl Key {
 	/// Get permissions for a bucket
 	pub fn bucket_permissions(&self, bucket: &Uuid) -> BucketKeyPerm {
 		self.params()
-			.map(|params| params.authorized_buckets.get(bucket))
-			.flatten()
+			.and_then(|params| params.authorized_buckets.get(bucket))
 			.cloned()
 			.unwrap_or(BucketKeyPerm::NO_PERMISSIONS)
 	}