findgptefisys
part = findgptefisys(devfd, &dl, NULL, NULL);
part = findgptefisys(devfd, &dl, &gpart, &gp);
static int findgptefisys(int, struct disklabel *, int *,
part = findgptefisys(devfd, &dl, NULL, NULL);
part = findgptefisys(devfd, &dl, &gpart, &gp);
int findgptefisys(int, struct disklabel *, int *,
efipart = findgptefisys(diskfd, &dl, &gpart, &gp);