vibrator impl: log failed callback

As help/sanity check when debugging.

Bug: N/A
Test: N/A
Change-Id: Ia45be148f1e6aebdb880d7da68d5b8bec8485127
diff --git a/vibrator/aidl/default/Vibrator.cpp b/vibrator/aidl/default/Vibrator.cpp
index a77c49a..befdeab 100644
--- a/vibrator/aidl/default/Vibrator.cpp
+++ b/vibrator/aidl/default/Vibrator.cpp
@@ -48,7 +48,9 @@
             LOG(INFO) << "Starting on on another thread";
             usleep(timeoutMs * 1000);
             LOG(INFO) << "Notifying on complete";
-            callback->onComplete();
+            if (!callback->onComplete().isOk()) {
+                LOG(ERROR) << "Failed to call onComplete";
+            }
         }).detach();
     }
     return ndk::ScopedAStatus::ok();