Fix field packer bug for U32 data.
Fix initial refcounts in allocations.
Support null references in allocations.

Change-Id: Ifba6406ba750e69737bd77fa7df5d7fb8e27a5b4
diff --git a/rsElement.cpp b/rsElement.cpp
index 5dee1fb..2602dd4 100644
--- a/rsElement.cpp
+++ b/rsElement.cpp
@@ -266,7 +266,7 @@
         if (mComponent.isReference()) {
             ObjectBase *const*obp = static_cast<ObjectBase *const*>(ptr);
             ObjectBase *ob = obp[0];
-            ob->incSysRef();
+            if (ob) ob->incSysRef();
         }
         return;
     }
@@ -285,7 +285,7 @@
         if (mComponent.isReference()) {
             ObjectBase *const*obp = static_cast<ObjectBase *const*>(ptr);
             ObjectBase *ob = obp[0];
-            ob->decSysRef();
+            if (ob) ob->decSysRef();
         }
         return;
     }