path_to_major
maj = path_to_major((char *)opp->oprom_array);
maj = path_to_major(p);
major = path_to_major(parent);
extern major_t path_to_major(char *pathname);
if ((maj = path_to_major(path)) == DDI_MAJOR_T_NONE) {
extern major_t path_to_major(char *);
if ((kb_major = path_to_major(path)) == (major_t)-1)