Camera2: Fix a potential race condition in the readout thread

Change-Id: Ie4475c8433eaad7545430f7e01e222d074180e0e

tools/emulator/system/camera/EmulatedFakeCamera2.cpp

@@ -1135,6 +1135,7 @@ void EmulatedFakeCamera2::ReadoutThread::setNextOperation(
         camera_metadata_t *request,
         Buffers *buffers) {
     Mutex::Autolock lock(mInputMutex);
+    Mutex::Autolock iLock(mInternalsMutex);
     if ( !readyForNextCapture() ) {
         ALOGE("In flight queue full, dropping captures");
         mParent->signalError();