Add crash test for extraneous bytes after SOS.

Author: filipl

tests/crashtest/images/README.md

@@ -1,7 +1,8 @@
-# File sources
+ File sources
 File                      | Source
 --------------------------| ------
 imagetestsuite/           | The files in this directory were taken from https://code.google.com/p/imagetestsuite/
 dc-predictor-overflow.jpg | Found by Wim Looman (@Nemo157) while fuzzing
 derive-huffman-codes-overflow.jpg | Found by Pascal Hertleif (@killercup) while fuzzing
 missing-sof.jpg           | Found by Corey Farwell (@frewsxcv) when fuzz testing
+extraneous-bytes-after-sos.jpg | Scan from brother DSmobile 920DW provided by Filip Lundborg (@filipl)