Currently, coccicheck fails with only the message "coccicheck failed"
and the error code for the failure. To obtain the error logs,
one needs to specify a debug file using the DEBUG_FILE option.

Modify coccicheck to display error logs when it crashes unless
DEBUG_FILE is set, in which case, the error logs are stored in
the specified debug file.
Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>