devm_turris_signing_key_create
ret = devm_turris_signing_key_create(dev,
err = devm_turris_signing_key_create(dev, &omnia_signing_key_subtype,
EXPORT_SYMBOL_GPL(devm_turris_signing_key_create);
devm_turris_signing_key_create(struct device *dev, const struct turris_signing_key_subtype *subtype,