asserting that people don't do stupid things.

src/common/gamecode/laws.c

@@ -3275,7 +3275,7 @@ new_units (void)
 
             g = getguard(u);
             if (g) setguard(u2, g);
-            else setguard(u, GUARD_NONE);
+            /* else setguard(u2, GUARD_NONE); */
 
             ordp = &makeord->next;
             newordersp = &u2->orders;

src/common/kernel/eressea.c

@@ -2432,6 +2432,7 @@ setguard(unit * u, unsigned int flags)
 {
   /* setzt die guard-flags der Einheit */
   attrib * a = NULL;
+  assert(flags==0 || !fval(u, UFL_MOVED));
   if (fval(u, UFL_GUARD)) {
     a = a_find(u->attribs, &at_guard);
   }