fix some lint and comment

src/matrix/room/timeline/entries/EventEntry.js

@@ -122,6 +122,7 @@ export class EventEntry extends BaseEventEntry {
         if (redactionEvent) {
             return redactionEvent.content?.reason;
         }
+        // fall back to local echo reason
         return super.redactionReason;
     }
 }

src/matrix/storage/idb/stores/RoomStateStore.js

@@ -26,10 +26,6 @@ export class RoomStateStore {
         this._roomStateStore = idbStore;
     }
 
-    getAllForType(roomId, type) {
-        throw new Error("unimplemented");
-    }
-
     get(roomId, type, stateKey) {
         const key = encodeKey(roomId, type, stateKey);
         return this._roomStateStore.get(key);

src/mocks/poll.js

@@ -15,7 +15,6 @@ limitations under the License.
 */
 
 export async function poll(fn) {
-    let result;
     do {
         const result = fn();
         if (result) {