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heretic: Fix integer overflow in A_Chase

--- a/src/heretic/p_enemy.c

+++ b/src/heretic/p_enemy.c

@@ -697,7 +697,7 @@

 //

     if (actor->movedir < 8)

     {

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

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

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

         if (delta > 0)

         {