Fix null deref crash

Change-Id: Ic1a64e926b5faa2f4cf8d079a2b67e0261dcecd7
Fixes: 62035692
Test: manual
diff --git a/libs/hwui/renderstate/RenderState.cpp b/libs/hwui/renderstate/RenderState.cpp
index b89272e..ed96d49 100644
--- a/libs/hwui/renderstate/RenderState.cpp
+++ b/libs/hwui/renderstate/RenderState.cpp
@@ -123,7 +123,7 @@
 }
 
 void RenderState::onBitmapDestroyed(uint32_t pixelRefId) {
-    if (mCaches->textureCache.destroyTexture(pixelRefId)) {
+    if (mCaches && mCaches->textureCache.destroyTexture(pixelRefId)) {
         glFlush();
         GL_CHECKPOINT(MODERATE);
     }