Replace CHECK(x && y) with two separate CHECK() calls

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index 5c2525cf2b803b4b1ec5a31cff1e57afe7d8e8fd..e4d7e7fca3e863d77b5ca43ff366e875f6cf3365 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -2501,7 +2501,8 @@ void Channel::RegisterSenderCongestionControlObjects(
 
   RTC_DCHECK(rtp_packet_sender);
   RTC_DCHECK(transport_feedback_observer);
-  RTC_DCHECK(packet_router && !packet_router_);
+  RTC_DCHECK(packet_router);
+  RTC_DCHECK(!packet_router_);
   rtcp_observer_->SetBandwidthObserver(bandwidth_observer);
   feedback_observer_proxy_->SetTransportFeedbackObserver(
       transport_feedback_observer);
@@ -2514,7 +2515,8 @@ void Channel::RegisterSenderCongestionControlObjects(
 
 void Channel::RegisterReceiverCongestionControlObjects(
     PacketRouter* packet_router) {
-  RTC_DCHECK(packet_router && !packet_router_);
+  RTC_DCHECK(packet_router);
+  RTC_DCHECK(!packet_router_);
   packet_router->AddReceiveRtpModule(_rtpRtcpModule.get());
   packet_router_ = packet_router;
 }