When results generation fails exit with code 3, it will help
to differentiate from failed exection at resume runs. Added
also some debug messages at different error points.

Cc: Petri Latvala <adrinael@adrinael.net>
Signed-off-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Petri Latvala <adrinael@adrinael.net>
Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org>