pc_findentry
error = pc_findentry(dp, namep, &slot, NULL);
error = pc_findentry(dp, shortname, &slot, NULL);
error = pc_findentry(dp, namep, &slot, NULL);
error = pc_findentry(dp, namep, &slot, &lfn_offset);
static int pc_findentry(struct pcnode *, char *, struct pcslot *, offset_t *);
error = pc_findentry(dp, snm, &slot, NULL);
error = pc_findentry(tdp, tnm, &slot, NULL);
error = pc_findentry(dp, snm, &slot, &lfn_offset);