Use -Werror in frameworks/native/cmds

* Remove unused variables.

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: Ifde10b651abbdb2ab1e236ebe47e25bf6c4c9b23
diff --git a/cmds/flatland/Android.mk b/cmds/flatland/Android.mk
index c295167..7aa111c 100644
--- a/cmds/flatland/Android.mk
+++ b/cmds/flatland/Android.mk
@@ -8,6 +8,8 @@
     Renderers.cpp   \
     Main.cpp        \
 
+LOCAL_CFLAGS := -Wall -Werror
+
 LOCAL_MODULE:= flatland
 
 LOCAL_MODULE_TAGS := tests
diff --git a/cmds/flatland/Main.cpp b/cmds/flatland/Main.cpp
index ec1e543..3d7cac0 100644
--- a/cmds/flatland/Main.cpp
+++ b/cmds/flatland/Main.cpp
@@ -284,7 +284,6 @@
 public:
 
     Layer() :
-        mFirstFrame(true),
         mGLHelper(NULL),
         mSurface(EGL_NO_SURFACE) {
     }
@@ -358,8 +357,6 @@
     }
 
 private:
-    bool mFirstFrame;
-
     LayerDesc mDesc;
 
     GLHelper* mGLHelper;
@@ -389,7 +386,6 @@
         ATRACE_CALL();
 
         bool result;
-        EGLint resulte;
 
         float scaleFactor = float(mDesc.runHeights[mInstance]) /
             float(mDesc.height);
@@ -465,7 +461,6 @@
         ATRACE_CALL();
 
         bool result;
-        status_t err;
 
         resetColorGenerator();