[automerger] Fix race between SensorManager ctor and callback am: 4b23ed10ae am: c88995f5d8 am: 2cd1ad424e

Change-Id: Ib67db083237bef98dc44674483340f5b95a8e4eb
diff --git a/libs/gui/SensorManager.cpp b/libs/gui/SensorManager.cpp
index 9fcf9ab..f49dd6e 100644
--- a/libs/gui/SensorManager.cpp
+++ b/libs/gui/SensorManager.cpp
@@ -90,7 +90,7 @@
 
 SensorManager::SensorManager(const String16& opPackageName)
     : mSensorList(0), mOpPackageName(opPackageName) {
-    // okay we're not locked here, but it's not needed during construction
+    Mutex::Autolock _l(mLock);
     assertStateLocked();
 }