Bufferpool: Check hidl call return value.

Hidl will crash if hidl call failed and return value was not checked.
Check hidl call return values.

Bug: 132182836
Change-Id: I910025a7b3c508b3c8f289a5286abbcc77e2d9b8

media/bufferpool/1.0/BufferPoolClient.cpp

@@ -528,6 +528,10 @@ void BufferPoolClient::Impl::trySyncFromRemote() {
                         (void) outStatus;
                         (void) outBuffer;
                     });
+            if(!transResult.isOk()) {
+                ALOGD("sync from client %lld failed: bufferpool process died.",
+                      (long long)mConnectionId);
+            }
         }
         mRemoteSyncLock.unlock();
     }

media/bufferpool/2.0/AccessorImpl.cpp

@@ -261,13 +261,19 @@ void Accessor::Impl::handleInvalidateAck() {
         mBufferPool.mInvalidation.onHandleAck(&observers, &invalidationId);
     }
     // Do not hold lock for send invalidations
+    size_t deadClients = 0;
     for (auto it = observers.begin(); it != observers.end(); ++it) {
         const sp<IObserver> observer = it->second;
         if (observer) {
             Return<void> transResult = observer->onMessage(it->first, invalidationId);
-            (void) transResult;
+            if (!transResult.isOk()) {
+                ++deadClients;
+            }
         }
     }
+    if (deadClients > 0) {
+        ALOGD("During invalidation found %zu dead clients", deadClients);
+    }
 }
 
 bool Accessor::Impl::isValid() {

media/bufferpool/2.0/BufferPoolClient.cpp

@@ -582,6 +582,10 @@ void BufferPoolClient::Impl::trySyncFromRemote() {
                         (void) outStatus;
                         (void) outBuffer;
                     });
+            if (!transResult.isOk()) {
+                ALOGD("sync from client %lld failed: bufferpool process died.",
+                      (long long)mConnectionId);
+            }
         }
         mRemoteSyncLock.unlock();
     }