ipcs: fix memleak in ipc_*_get_info functions

In case of error (maxid < 0) we do not enter following for loop. It will
return 0 and free the structs afterwards because i is still 0.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
travis-ci: abort if make check fails

make check should work now on current travis build image.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>