Fix build

Change-Id: I24d82c44db9d9e04098a0d7cb9289d6b9fc19e41
diff --git a/libs/hwui/ClipArea.cpp b/libs/hwui/ClipArea.cpp
index 0ae3e89..e368537 100644
--- a/libs/hwui/ClipArea.cpp
+++ b/libs/hwui/ClipArea.cpp
@@ -361,7 +361,7 @@
             "expect RectangleList to be trivially destructible");
 
     if (mLastSerialization == nullptr) {
-        ClipBase* serialization;
+        ClipBase* serialization = nullptr;
         switch (mMode) {
         case ClipMode::Rectangle:
             serialization = allocator.create<ClipRect>(mClipRect);