[libomptarget][nfc] Squash unused variable warning

Suppress only current warning on openmp-clang-x86_64-linux-debian

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D106777

openmp/libomptarget/src/device.cpp

@@ -90,6 +90,7 @@ int DeviceTy::associatePtr(void *HstPtrBegin, void *TgtPtrBegin, int64_t Size) {
      DPxPTR(newEntry.HstPtrBase), DPxPTR(newEntry.HstPtrBegin),
      DPxPTR(newEntry.HstPtrEnd), DPxPTR(newEntry.TgtPtrBegin),
      newEntry.refCountToStr().c_str());
+  (void)newEntry;
 
   DataMapMtx.unlock();