Clean up postgres client creation slightly

Author: ananace

src/database.rs

@@ -28,13 +28,11 @@ pub fn get_data_from_db(
     room_id: &str,
     max_state_group: Option<i64>,
 ) -> BTreeMap<i64, StateGroupEntry> {
-    let mut client : postgres::Client;
-
     let mut builder = SslConnector::builder(SslMethod::tls()).unwrap();
     builder.set_verify(SslVerifyMode::NONE);
     let connector = MakeTlsConnector::new(builder.build());
 
-    client = Client::connect(db_url, connector).unwrap();
+    let mut client = Client::connect(db_url, connector).unwrap();
 
     let mut state_group_map = get_initial_data_from_db(&mut client, room_id, max_state_group);