Memory leak in UPCEANExtension2Support.decodeRow

[JedrzejczykRobert]

After apply #142

file: ZXing.OneD.UPCEANExtension2Support
line: 110

current:

  if (extensionData <> nil)
  then
     extensionResult.putAllMetadata(extensionData);

should be:

  if (extensionData <> nil) then
  begin
    extensionResult.putAllMetadata(extensionData);
    FreeAndNil(extensionData);
  end;