Actually fail when we get conflicting marker counts in JPEG

Bug: oss-fuzz:55289
Change-Id: I859b493a71ad6b14937a13fbf492b40bf1f22aaa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/633517
Reviewed-by: Christopher Cameron <ccameron@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Christopher Cameron <ccameron@google.com>