efivar_device_path_to_unix_path
int efivar_device_path_to_unix_path(const_efidp dp, char **dev, char **relpath, char **abspath);
if (efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath) != 0)
rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);
rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);
rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);