devfs_get_maj_min - Get the major and minor numbers for a devfs entry.
int devfs_get_maj_min (devfs_handle_t de, unsigned int *major, unsigned int *minor);
de The handle to the device entry. major The major number is written here. This may be NULL. minor The minor number is written here. This may be NULL.
Returns 0 on success, else a negative error code.