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ip/torrent: check piece offset, vlong cast

--- a/sys/src/cmd/ip/torrent.c

+++ b/sys/src/cmd/ip/torrent.c

@@ -192,11 +192,11 @@

 	int n, m;

 	File *f;

-	if(len <= 0 || poff >= pieces[index].len)

+	if(len <= 0 || poff < 0 || poff >= pieces[index].len)

 		return 0;

 	if(len+poff > pieces[index].len)

 		len = pieces[index].len - poff;

-	off = (vlong)index * blocksize;

+	off = (vlong)index * (vlong)blocksize;

 	off += poff;

 	for(f = files; f; f = f->next)

 		if((f->off+f->len) > off)