when a zero dimension buffer is allocated, turn the allocation into
a 1x1 buffer instead of Nx1 (or 1xN)

Change-Id: I27eeb15e83e13002dd9405f4e52b54f7dffc0fe7
diff --git a/include/ui/GraphicBufferAllocator.h b/include/ui/GraphicBufferAllocator.h
index 741d763..54b8236 100644
--- a/include/ui/GraphicBufferAllocator.h
+++ b/include/ui/GraphicBufferAllocator.h
@@ -73,9 +73,9 @@
     struct alloc_rec_t {
         uint32_t w;
         uint32_t h;
+        uint32_t s;
         PixelFormat format;
         uint32_t usage;
-        void* vaddr;
         size_t size;
     };