Handle error returned by IBurstContext::freeMemory

Unhandled HIDL errors result in a crash. This CL handles any errors from
IBurstContext::freeMemory by logging the error and continuing with the
rest of the function.

Bug: N/A
Test: mma
Change-Id: Ic433a627137df4d275a1b0d2d800d592afc1a18c
diff --git a/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp b/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp
index b4b6f68..8ce96c4 100644
--- a/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp
+++ b/neuralnetworks/1.2/utils/src/ExecutionBurstController.cpp
@@ -176,7 +176,10 @@
         std::lock_guard guard(mMutex);
         const int32_t slot = mMemoryIdToSlot.at(memory);
         if (mBurstContext) {
-            mBurstContext->freeMemory(slot);
+            const auto ret = mBurstContext->freeMemory(slot);
+            if (!ret.isOk()) {
+                LOG(ERROR) << "IBustContext::freeMemory failed: " << ret.description();
+            }
         }
         mMemoryIdToSlot.erase(memory);
         mMemoryCache[slot] = {};