Fix unitialized field in HWC2on1Adapter

Bug: 33487853
Test: AUPT
Change-Id: If271eb6b9d357047b41fed19a2079325970132a7
diff --git a/services/surfaceflinger/DisplayHardware/HWC2On1Adapter.cpp b/services/surfaceflinger/DisplayHardware/HWC2On1Adapter.cpp
index 2b603cc..cfac864 100644
--- a/services/surfaceflinger/DisplayHardware/HWC2On1Adapter.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWC2On1Adapter.cpp
@@ -2010,7 +2010,8 @@
     mZ(0),
     mReleaseFence(),
     mHwc1Id(0),
-    mHasUnsupportedPlaneAlpha(false) {}
+    mHasUnsupportedPlaneAlpha(false),
+    mHasUnsupportedBackgroundColor(false) {}
 
 bool HWC2On1Adapter::SortLayersByZ::operator()(
         const std::shared_ptr<Layer>& lhs, const std::shared_ptr<Layer>& rhs)