fix: empty statment

src/Avalonia.Base/Data/Core/Plugins/ObservableStreamPlugin.cs

@@ -42,7 +42,7 @@ namespace Avalonia.Data.Core.Plugins
             if (target is IObservable<object?> result)
             {
                 return result;
-            };
+            }
 
             // If the observable returns a value type then we need to call Observable.Select on it.
             // First get the type of T in `IObservable<T>`.

src/Avalonia.Base/Input/GestureRecognizers/ScrollGestureRecognizer.cs

@@ -71,7 +71,7 @@ namespace Avalonia.Input.GestureRecognizers
             {
                 EndGesture();
                 _tracking = e.Pointer;
-                _gestureId = ScrollGestureEventArgs.GetNextFreeId();;
+                _gestureId = ScrollGestureEventArgs.GetNextFreeId();
                 _trackedRootPoint = e.GetPosition(_target);
             }
         }

src/Avalonia.Base/Layout/FlowLayoutAlgorithm.cs

@@ -523,7 +523,7 @@ namespace Avalonia.Layout
             {
                 firstRealizedElement = _elementManager.GetAt(0);
                 firstBounds = _elementManager.GetLayoutBoundsForRealizedIndex(0);
-                firstDataIndex = _elementManager.GetDataIndexFromRealizedRangeIndex(0);;
+                firstDataIndex = _elementManager.GetDataIndexFromRealizedRangeIndex(0);
 
                 int last = _elementManager.GetRealizedElementCount() - 1;
                 lastRealizedElement = _elementManager.GetAt(last);