[functions] Ignore modinfo built-in modules
modinfo have started reporting filenames as "(builtin)" on built-in modules. Ignore these and continue with other modules.
Fixes: https://bugs.archlinux.org/task/65564 Introduced in: https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/commit/?id=e7e2cb61fa9f1db3429d91ef6accff549500d268
Signed-off-by: Morten Linderud morten@linderud.pw