Small fix in F_N

BTW pretty sure we have alot of junk in
Layer::Layer(SurfaceFlinger* flinger, const sp<Client>& client,

Change-Id: I34c1001df93d6eb0c218d50e2f4c7b91d2678eae
Reconcile HWComposer with CM

Change-Id: Ia31e64dec2235d3b2d59486fa9064dadf42d53d6