Initialize the SurfaceTexture buffer slots.

Change-Id: I81a562ad897173f33cd6a2127737718a7db610eb
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index 9579996..479d803 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -36,6 +36,11 @@
 SurfaceTexture::SurfaceTexture(GLuint tex) :
     mBufferCount(MIN_BUFFER_SLOTS), mCurrentTexture(INVALID_BUFFER_SLOT),
     mLastQueued(INVALID_BUFFER_SLOT), mTexName(tex) {
+    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+        mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
+        mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
+        mSlots[i].mOwnedByClient = false;
+    }
 }
 
 SurfaceTexture::~SurfaceTexture() {