Fix a race condition where Camera2Session forgot to return the texture frame when closing the camer…

webrtc/api/android/java/src/org/webrtc/Camera2Session.java

Index: webrtc/api/android/java/src/org/webrtc/Camera2Session.java
diff --git a/webrtc/api/android/java/src/org/webrtc/Camera2Session.java b/webrtc/api/android/java/src/org/webrtc/Camera2Session.java
index 9bcdfafa204c55907b72af1a789ba900b0ced421..9546b8a55401277566689dac62b9955368ef93e6 100644
--- a/webrtc/api/android/java/src/org/webrtc/Camera2Session.java
+++ b/webrtc/api/android/java/src/org/webrtc/Camera2Session.java
@@ -176,6 +176,7 @@ public class Camera2Session implements CameraSession {
 
               if (state != SessionState.RUNNING) {
                 Logging.d(TAG, "Texture frame captured but camera is no longer running.");
+                surfaceTextureHelper.returnTextureFrame();
                 return;
               }