Modifies invalid DCHECK in AudioRecordJni::OnCacheDirectBufferAddress()

webrtc/modules/audio_device/android/audio_track_jni.cc

Index: webrtc/modules/audio_device/android/audio_track_jni.cc
diff --git a/webrtc/modules/audio_device/android/audio_track_jni.cc b/webrtc/modules/audio_device/android/audio_track_jni.cc
index 297916f824553845e087756711450a1b9fd5c3b6..99cd23be1d265d951d8b8d881c4ece33a8838c98 100644
--- a/webrtc/modules/audio_device/android/audio_track_jni.cc
+++ b/webrtc/modules/audio_device/android/audio_track_jni.cc
@@ -120,6 +120,7 @@ int32_t AudioTrackJni::InitPlayout() {
   ALOGD("InitPlayout%s", GetThreadInfo().c_str());
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   RTC_DCHECK(!initialized_);
+  RTC_DCHECK(!direct_buffer_address_);
   RTC_DCHECK(!playing_);
   j_audio_track_->InitPlayout(
       audio_parameters_.sample_rate(), audio_parameters_.channels());
@@ -156,6 +157,7 @@ int32_t AudioTrackJni::StopPlayout() {
   thread_checker_java_.DetachFromThread();
   initialized_ = false;
   playing_ = false;
+  direct_buffer_address_ = nullptr;
   return 0;
 }