don't hang tests on dial failure

simul_test.go

@@ -27,13 +27,13 @@ func TestSimultOpen(t *testing.T) {
 	{
 		var wg sync.WaitGroup
 		connect := func(s *Swarm, dst peer.ID, addr ma.Multiaddr) {
+			defer wg.Done()
 			// copy for other peer
 			log.Debugf("TestSimultOpen: connecting: %s --> %s (%s)", s.LocalPeer(), dst, addr)
 			s.Peerstore().AddAddr(dst, addr, pstore.PermanentAddrTTL)
 			if _, err := s.DialPeer(ctx, dst); err != nil {
-				t.Fatal("error swarm dialing to peer", err)
+				t.Error("error swarm dialing to peer", err)
 			}
-			wg.Done()
 		}
 
 		log.Info("Connecting swarms simultaneously.")