Camera2: Fix a deadlock when closing the camera

Change-Id: I8b6be364ca90b0eed62ae03c1548680c0b2f0e64

tools/emulator/system/camera/EmulatedFakeCamera2.cpp

@@ -165,6 +165,7 @@ status_t EmulatedFakeCamera2::connectCamera(hw_device_t** device) {
 }
 
 status_t EmulatedFakeCamera2::closeCamera() {
+    {
         Mutex::Autolock l(mMutex);
 
         status_t res;
@@ -180,7 +181,10 @@ status_t EmulatedFakeCamera2::closeCamera() {
         mReadoutThread->requestExit();
         mControlThread->requestExit();
         mJpegCompressor->cancel();
+    }
 
+    // give up the lock since we will now block and the threads
+    // can call back into this object
     mConfigureThread->join();
     mReadoutThread->join();
     mControlThread->join();