ANativeWindow_setBuffersGeometry now returns proper error codes

Change-Id: Iac59d513fa1d4a55b8378000714d344ef3e2e0a4
diff --git a/native/include/android/native_window.h b/native/include/android/native_window.h
index f3d7550..337fa96 100644
--- a/native/include/android/native_window.h
+++ b/native/include/android/native_window.h
@@ -95,6 +95,9 @@
  *
  * For all of these parameters, if 0 is supplied then the window's base
  * value will come back in force.
+ *
+ * width and height must be either both zero or both non-zero.
+ *
  */
 int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window, int32_t width, int32_t height, int32_t format);