many: fix remaining check-pointer-deref issues

The updated parsing_hacks.h file uncovered a bunch of extra
things that the check-pointer-deref coccinelle script flags.

This commit fixes them to make the tree check-pointer-deref clean.

src/sysupdate/sysupdate-transfer.c

@@ -1009,6 +1009,7 @@ static int callout_context_new(const Transfer *t, const Instance *i, TransferPro
         assert(t);
         assert(i);
         assert(cb);
+        assert(ret);
 
         ctx = new(CalloutContext, 1);
         if (!ctx)