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strife: Fix integer overflow in A_RandomWalk

--- a/src/strife/p_enemy.c

+++ b/src/strife/p_enemy.c

@@ -931,7 +931,7 @@

         {

             int delta;

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

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

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

             if(delta < 0)