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/machine/machinectl.c

@@ -193,6 +193,7 @@ static int call_get_addresses(
         assert(name);
         assert(prefix);
         assert(prefix2);
+        assert(ret);
 
         r = bus_call_method(bus, bus_machine_mgr, "GetMachineAddresses", NULL, &reply, "s", name);
         if (r < 0)

src/machine/machined-dbus.c

@@ -257,6 +257,8 @@ static int machine_add_from_params(
         assert(message);
         assert(name);
         assert(c == _MACHINE_CLASS_INVALID || MACHINE_CLASS_CAN_REGISTER(c));
+        assert(leader_pidref);
+        assert(supervisor_pidref);
         assert(ret);
 
         if (leader_pidref->pid == 1)