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doom: Fix integer overflow in A_Chase

--- a/src/doom/p_enemy.c

+++ b/src/doom/p_enemy.c

@@ -684,7 +684,7 @@

     // turn towards movement direction if not there yet

     if (actor->movedir < 8)

     {

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

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

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

 	if (delta > 0)