fixed inconsistent upload_only and seed in some cases when running a metadata-less torrent

src/bt_peer_connection.cpp

@@ -2635,6 +2635,8 @@ namespace libtorrent
 
 		TORRENT_ASSERT(!m_rc4_encrypted || m_RC4_handler.get());
 #endif
+		if (is_seed()) TORRENT_ASSERT(upload_only());
+
 		if (!in_handshake())
 		{
 			TORRENT_ASSERT(m_sent_handshake);

src/peer_connection.cpp

@@ -519,6 +519,7 @@ namespace libtorrent
 #endif
 			// if this is a web seed. we don't have a peer_info struct
 			if (m_peer_info) m_peer_info->seed = true;
+			m_upload_only = true;
 
 			t->peer_has_all();
 			if (t->is_finished()) send_not_interested();