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

webrtc/p2p/client/basicportallocator.cc

Index: webrtc/p2p/client/basicportallocator.cc
diff --git a/webrtc/p2p/client/basicportallocator.cc b/webrtc/p2p/client/basicportallocator.cc
index 091819ac43f1d0e1420bcd123bb6c6384fd67291..c5d741211f9dfc2c75dca80c7dfd837430431719 100644
--- a/webrtc/p2p/client/basicportallocator.cc
+++ b/webrtc/p2p/client/basicportallocator.cc
@@ -1353,7 +1353,8 @@ void AllocationSequence::CreateRelayPorts() {
 
   // If BasicPortAllocatorSession::OnAllocate left relay ports enabled then we
   // ought to have a relay list for them here.
-  RTC_DCHECK(config_ && !config_->relays.empty());
+  RTC_DCHECK(config_);
+  RTC_DCHECK(!config_->relays.empty());
   if (!(config_ && !config_->relays.empty())) {
     LOG(LS_WARNING)
         << "AllocationSequence: No relay server configured, skipping.";