Fix crash with new LookupGammaFontRenderer
Bug #6853934

Change-Id: I15e6ca73bfe00eff1a37c4b9d2f7f709ee018eb6
diff --git a/libs/hwui/FontRenderer.h b/libs/hwui/FontRenderer.h
index 2ab680e..b7b4ec9 100644
--- a/libs/hwui/FontRenderer.h
+++ b/libs/hwui/FontRenderer.h
@@ -61,9 +61,8 @@
 
 class CacheTexture {
 public:
-    CacheTexture() { }
-    CacheTexture(uint8_t* texture, uint16_t width, uint16_t height) :
-            mTexture(texture), mTextureId(0), mWidth(width), mHeight(height),
+    CacheTexture(uint16_t width, uint16_t height) :
+            mTexture(NULL), mTextureId(0), mWidth(width), mHeight(height),
             mLinearFiltering(false) { }
     ~CacheTexture() {
         if (mTexture) {