drm_hwcomposer: Remove unused variable

BUG=None
TEST=Compiles

Change-Id: I8a003dc14828ed0c10fd161b00d1bc1c5069431f
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmdisplaycompositor.cpp b/drmdisplaycompositor.cpp
index 9f1825c..aaef8e4 100644
--- a/drmdisplaycompositor.cpp
+++ b/drmdisplaycompositor.cpp
@@ -606,8 +606,6 @@
   std::vector<DrmCompositionRegion> &pre_comp_regions =
       display_comp->pre_comp_regions();
 
-  DrmFramebuffer *pre_comp_fb;
-
   DrmConnector *connector = drm_->GetConnectorForDisplay(display_);
   if (!connector) {
     ALOGE("Could not locate connector for display %d", display_);