revert Frame Dispose

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -187,8 +187,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             where TPixel : unmanaged, IPixel<TPixel>
         {
             using var spectralConverter = new SpectralConverter<TPixel>(this.Configuration);
-            try
+
-            {
             var scanDecoder = new HuffmanScanDecoder(stream, spectralConverter, cancellationToken);
 
             this.ParseStream(stream, scanDecoder, cancellationToken);
@@ -203,12 +202,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 spectralConverter.GetPixelBuffer(cancellationToken),
                 this.Metadata);
         }
-            catch
-            {
-                this.Frame?.Dispose();
-                throw;
-            }
-        }
 
         /// <inheritdoc/>
         public IImageInfo Identify(BufferedReadStream stream, CancellationToken cancellationToken)