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torrent: fix trailing amp in announce url

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

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

@@ -355,9 +355,9 @@

 				return 1;

 			if(memcmp(buf, "\x13BitTorrent protocol", 20))

 				return 0;

-			if(debug) fprint(2, "peer %s: <- handshake\n", addr);

 			if(memcmp(infohash, buf + 20 + 8, sizeof(infohash)))

 				return 0;

+			if(debug) fprint(2, "peer %s: <- handshake\n", addr);

 		}

 	}

 	if(readn(fd, buf, sizeof(peerid)) != sizeof(peerid))

@@ -376,7 +376,7 @@

 	if(debug) fprint(2, "peer %s: -> bitfield %d\n", addr, nhavemap);

 	memmove(told, havemap, nhavemap);

-	n = pack(buf, sizeof(buf), "lb*", nhavemap+1, 0x05, nhavemap, havemap);

+	n = pack(buf, sizeof(buf), "lb*", nhavemap+1, 0x05, nhavemap, told);

 	if(write(fd, buf, n) != n)

 		goto Out;

@@ -679,7 +679,7 @@

 	if(rfork(RFPROC|RFMEM))

 		return;

-	event = "event=started";

+	event = "&event=started";

 	for(;;){

 		vlong up, down, left;

@@ -691,7 +691,7 @@

 		d = nil;

 		if((fd = hopen("%s?info_hash=%.*H&peer_id=%.*H&port=%d&"

-			"uploaded=%lld&downloaded=%lld&left=%lld&compact=1&no_peer_id=1&%s",

+			"uploaded=%lld&downloaded=%lld&left=%lld&compact=1&no_peer_id=1%s",

 			url, sizeof(infohash), infohash, sizeof(peerid), peerid, port,

 			up, down, left, event)) >= 0){

 			event = "";