Merge pull request #534 from denisivan0v/denisivan0v/array-pool-usage-fix

Disposing data chunk instead of explicit returning it to ArrayPool in PngDecoderCore.Identify

src/ImageSharp/Formats/Png/PngDecoderCore.cs

@@ -313,11 +313,7 @@ namespace SixLabors.ImageSharp.Formats.Png
                     }
                     finally
                     {
-                        // Data is rented in ReadChunkData()
-                        if (chunk.Data != null)
-                        {
-                            ArrayPool<byte>.Shared.Return(chunk.Data.Array);
-                        }
+                        chunk.Data?.Dispose(); // Data is rented in ReadChunkData()
                     }
                 }
             }