Revert 0xFF marker check

[ggopcceop]

I has some webcam from different venders that i use v4l2 to capture mjpg images to do some processing. When i used image-rs to decode some of the images, i got Error: IoError(Custom { kind: UnexpectedEof, error: "failed to fill whole buffer" }).

After some investigation i found that the

jpeg-decoder/src/decoder.rs

Line 352 in 0c6f5a2

fn read_marker(&mut self) -> Result<Marker> {

function skipped EOI marker when there is multiple 0xff before 0xD9.

And there is pull request from #100 that removed code to skip optional 0xff. So I added it back.

There is also a test image i took that have this error before. but I'm not sure where to put this image in the tests dir, since the crash test doest care decode result.

[197g]

Looks good to me. I was confused with the wording for a moment, it doesn't directly revert the previous change here but amends which fixes further cases. Is the test image your own, or is there other copyright attached?

[ggopcceop]

Sorry about the confusion. And yes, I took that image my self, you have my consent to use the image freely.