api: Remove some build warnings, muts and vars

fractal-matrix-api/src/backend/room.rs

@@ -106,7 +106,7 @@ pub fn get_room_members(bk: &Backend, roomid: String) -> Result<(), Error> {
     get!(&url,
         |r: JsonValue| {
             let joined = r["joined"].as_object().unwrap();
-            let mut ms: Vec<Member> = joined.iter().map(|(mxid, member_data)| {
+            let ms: Vec<Member> = joined.iter().map(|(mxid, member_data)| {
                 let alias = &member_data["display_name"];
                 let avatar = &member_data["avatar_url"];
 
@@ -471,7 +471,7 @@ pub fn direct_chat(bk: &Backend, user: Member, internal_id: String) -> Result<()
             r.direct = true;
             tx.send(BKResponse::NewRoom(r, internal_id)).unwrap();
 
-            let mut directs = &mut data.lock().unwrap().m_direct;
+            let directs = &mut data.lock().unwrap().m_direct;
             if directs.contains_key(&m.uid) {
                 directs.get_mut(&m.uid).map(|v| v.push(id.clone()));
             } else {

fractal-matrix-api/src/backend/sync.rs

@@ -65,7 +65,6 @@ pub fn sync(bk: &Backend) -> Result<(), Error> {
             Ok(r) => {
                 let next_batch = String::from(r["next_batch"].as_str().unwrap_or(""));
                 if since.is_empty() {
-                    let m_direct = parse_m_direct(&r);
                     data.lock().unwrap().m_direct = parse_m_direct(&r);
 
                     let rooms = match get_rooms_from_json(&r, &userid, &baseu) {