Remove unnecessary local variant definitation.

'Vector<DisplayState> displays' has been not used in the approach of
SurfaceFlinger::initializeDisplays(), so just remove it.

Test: atest SurfaceFlinger_InitializeDisplaysTest

Change-Id: I6bb063ccef487ab23bc97e72e342353bdcaea748
Signed-off-by: jiayongqiang <jiayongqiang@xiaomi.com>
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index ee3505d..343a1db 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -5438,7 +5438,6 @@
     state.id = transactionId;
 
     // reset screen orientation and use primary layer stack
-    Vector<DisplayState> displays;
     DisplayState d;
     d.what = DisplayState::eDisplayProjectionChanged |
              DisplayState::eLayerStackChanged;