Comment out unused error messages in lzx decoder

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Merge branch 'master' of ssh://git.code.sf.net/p/xmp/libxmp
[test] Also check for channel data

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
[test] Add IT loader test module

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>