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torrent: avoid trying to fetch blocks past file

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

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

@@ -811,7 +811,8 @@

 			}

 		}

 	}

-	havepiece(off / blocksize, w->str);

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

+		havepiece(off / blocksize, w->str);

 	havepiece(f->off / blocksize, w->str);

 	close(fd);

 	exits(0);