cosmetic: Don't call the SDR "USRP" in error message

Transceiver.cpp is used for all SDR hardware we support, not just USRP.

Change-Id: I9b7ddb0d679f111407704048ef3ddd964db49441
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index 442853f..df1c0bd 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -388,7 +388,7 @@
     state = &mStates[i];
 
     while ((burst = mTxPriorityQueues[i].getStaleBurst(nowTime))) {
-      LOG(NOTICE) << "chan " << i << " dumping STALE burst in TRX->USRP interface ("
+      LOG(NOTICE) << "chan " << i << " dumping STALE burst in TRX->SDR interface ("
                   << burst->getTime() <<" vs " << nowTime << "), retrans=" << state->mRetrans;
       if (state->mRetrans)
         updateFillerTable(i, burst);