Accommodate [[nodiscard]] std::lock_guard in updated libc++ am: 164ecc7727 am: 25d1840a1e am: ea664191bd am: d7d78b1188 am: 36c4dfe35a

Original change: https://android-review.googlesource.com/c/platform/system/incremental_delivery/+/2674657

Change-Id: I48ad96b2e26a66f18bbad10618211816dece1aca
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/libdataloader/DataLoaderConnector.cpp b/libdataloader/DataLoaderConnector.cpp
index f5f82ea..0206cf1 100644
--- a/libdataloader/DataLoaderConnector.cpp
+++ b/libdataloader/DataLoaderConnector.cpp
@@ -401,8 +401,8 @@
         // Stopping both loopers and waiting for them to exit - we should be able to acquire/release
         // both mutexes.
         mRunning = false;
-        std::lock_guard{mPendingReadsLooperBusy}; // NOLINT
-        std::lock_guard{mLogLooperBusy}; // NOLINT
+        (void)std::lock_guard{mPendingReadsLooperBusy}; // NOLINT
+        (void)std::lock_guard{mLogLooperBusy};          // NOLINT
 
         if (mDataLoader->onStop) {
             mDataLoader->onStop(mDataLoader);