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hexen: Fix integer overflow in A_SerpentWalk

--- a/src/hexen/p_enemy.c

+++ b/src/hexen/p_enemy.c

@@ -2229,7 +2229,7 @@

 //

     if (actor->movedir < 8)

     {

-        actor->angle &= (7 << 29);

+        actor->angle &= (7u << 29);

         delta = actor->angle - (actor->movedir << 29);

         if (delta > 0)

         {