fix: fixes some clippy lints (#637)

Author: tuddman

xmtp_api_grpc/src/auth_token.rs

@@ -55,8 +55,7 @@ impl Authenticator {
         let mut token_bytes = Vec::new();
         let _ = token.encode(&mut token_bytes);
 
-        let token_base64 = base64::engine::general_purpose::STANDARD.encode(&token_bytes);
-        token_base64
+        base64::engine::general_purpose::STANDARD.encode(&token_bytes)
     }
 
     fn sign(&self, bytes_to_sign: &[u8]) -> Signature {

xmtp_mls/src/groups/members.rs

@@ -38,9 +38,7 @@ pub fn aggregate_member_list(openmls_group: &OpenMlsGroup) -> Result<Vec<GroupMe
     let member_map: HashMap<String, GroupMember> = openmls_group
         .members()
         .filter_map(|member| {
-            let basic_credential = BasicCredential::try_from(&member.credential)
-                .ok()
-                .map(|basic_credential| (basic_credential))?;
+            let basic_credential = BasicCredential::try_from(&member.credential).ok()?;
             Identity::get_validated_account_address(
                 basic_credential.identity(),
                 &member.signature_key,

xmtp_mls/src/groups/subscriptions.rs

@@ -95,7 +95,6 @@ where
 mod tests {
     use prost::Message;
     use xmtp_cryptography::utils::generate_local_wallet;
-    use xmtp_proto::xmtp::mls::api::v1::GroupMessage;
 
     use crate::{builder::ClientBuilder, storage::group_message::GroupMessageKind};
     use futures::StreamExt;