Delete a local ref in getSurface

ANativeWindow_fromSurface() provides a native-only call path to
android_view_Surface_getSurface(), so we need to clean up the
local reference.

Bug 14087233

Change-Id: I92aa5aa492c47a0642fdcb28c717ad7f874e1ad9

core/jni/android_view_Surface.cpp

@@ -95,6 +95,7 @@ sp<Surface> android_view_Surface_getSurface(JNIEnv* env, jobject surfaceObj) {
                 env->GetLongField(surfaceObj, gSurfaceClassInfo.mNativeObject));
         env->MonitorExit(lock);
     }
+    env->DeleteLocalRef(lock);
     return sur;
 }