fix: invite无应答发生crash问题

live.go

@@ -157,6 +157,9 @@ func (d *Device) Invite(inviteType InviteType, streamId StreamID, channelId, sta
 
 	if err != nil {
 		return nil, nil, err
+	} else if dialogRequest == nil {
+		// invite 没有收到任何应答
+		return nil, nil, fmt.Errorf("invite request timeout")
 	} else if "active" == setup {
 		// 如果是TCP主动拉流, 还需要将拉流地址告知给流媒体服务
 		var answer *sdp.SDP

stream_manager.go

@@ -72,10 +72,9 @@ func (s *streamManager) Remove(id StreamID) *Stream {
 	if ok && stream.Dialog != nil {
 		callID, _ := stream.Dialog.CallID()
 		delete(s.callIds, callID.Value())
-		return stream
 	}
 
-	return nil
+	return stream
 }
 
 func (s *streamManager) RemoveWithCallId(id string) *Stream {