block 824818 by 824721 thanks I am not clear what changed in the 1.1.0 release but this works now:
mathieu@debian:~/charls-1.1.0$ ./charlstest -decodetopnm JPEG_LS_InvalidEscapeSequence.jls JPEG_LS_InvalidEscapeSequence.pgm mathieu@debian:~/charls-1.1.0$ md5sum JPEG_LS_InvalidEscapeSequence.pgm 596da5bc228ea42784f9780517e071d3 JPEG_LS_InvalidEscapeSequence.pgm