Harden construction sites of android::StrongPointer.

Bug: 393217449
Test: presubmit
Flag: EXEMPT_refactor
Change-Id: Icf703aed608531e9b302b299481af00a52074731
diff --git a/libs/gui/BufferItem.cpp b/libs/gui/BufferItem.cpp
index 3b2d337..9dcd5dc 100644
--- a/libs/gui/BufferItem.cpp
+++ b/libs/gui/BufferItem.cpp
@@ -215,14 +215,14 @@
     FlattenableUtils::read(buffer, size, flags);
 
     if (flags & 1) {
-        mGraphicBuffer = new GraphicBuffer();
+        mGraphicBuffer = sp<GraphicBuffer>::make();
         status_t err = mGraphicBuffer->unflatten(buffer, size, fds, count);
         if (err) return err;
         size -= FlattenableUtils::align<4>(buffer);
     }
 
     if (flags & 2) {
-        mFence = new Fence();
+        mFence = sp<Fence>::make();
         status_t err = mFence->unflatten(buffer, size, fds, count);
         if (err) return err;
         size -= FlattenableUtils::align<4>(buffer);