Fixed ArrayWriter memory expansion condition

src/HotChocolate/Utilities/src/Utilities/ArrayWriter.cs

@@ -177,7 +177,7 @@ private void EnsureBufferCapacity(int neededCapacity)
 
             // if that new buffer size is not enough to satisfy the needed capacity
             // we add the needed capacity to the doubled buffer capacity.
-            if (neededCapacity > buffer.Length)
+            if (neededCapacity > newSize)
             {
                 newSize += neededCapacity;
             }