asserts for unchoke slot handling

src/peer_connection.cpp

@@ -280,6 +280,7 @@ namespace libtorrent
 	bool peer_connection::unchoke_compare(boost::intrusive_ptr<peer_connection const> const& p) const
 	{
 		TORRENT_ASSERT(p);
+		TORRENT_ASSERT(this != p);
 		peer_connection const& rhs = *p;
 
 		// first compare how many bytes they've sent us

src/session_impl.cpp

@@ -1417,6 +1417,7 @@ namespace aux {
 			, end(m_connections.end()); i != end; ++i)
 		{
 			peer_connection* p = i->get();
+			TORRENT_ASSERT(p);
 			torrent* t = p->associated_torrent().lock().get();
 			if (!p->peer_info_struct()
 				|| t == 0