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truetypefs: fix subfont indices (thanks aiju!)

--- a/sys/src/cmd/truetypefs.c

+++ b/sys/src/cmd/truetypefs.c

@@ -99,15 +99,15 @@

 	for(c = u->cmap; c < u->cmap + u->ncmap; c++){

 		for(k = c->start; k < c->end; k += MAXSUB){

 			s = emalloc(sizeof(TSubfont));

-			s->start = c->start;

-			if(c->start == 0) got0 = 1;

+			s->start = k;

+			if(k == 0) got0 = 1;

 			s->end = k + MAXSUB - 1;

 			if(s->end > c->end)

 				s->end = c->end;

 			s->font = f;

 			s->qid = (Qid){qidgen(), 0, 0};

-			s->next = f->sub[c->start >> 8 & 0xff];

-			f->sub[c->start >> 8 & 0xff] = s;

+			s->next = f->sub[k >> 8 & 0xff];

+			f->sub[k >> 8 & 0xff] = s;

 			fmtprint(&fmt, "%#.4ux\t%#.4ux\ts.%.4ux-%.4ux\n", s->start, s->end, s->start, s->end);

 		}

 	}