Fix compile errors in JPEG MPF utilities

Change-Id: If4edd38da84ea5ebd035f4d4174ebca0312318a0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/644038
Reviewed-by: Ben Wagner <bungeman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed