From 1acd8fd5491448e7844d4b817b395867ba383089 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Sun, 28 Aug 2022 18:29:09 +0300
Subject: [PATCH] Fix migrating monster throwing a potion

When a monster did something trying to get out of a boulder fort,
it usually meant teleporting or going down stairs or a hole.
The code didn't check for the action return value, and resulted
in a migrating monster being able to throw a potion at hero.
---
 src/monmove.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/monmove.c b/src/monmove.c
index ff5f6cfd1..c84bd789b 100644
--- a/src/monmove.c
+++ b/src/monmove.c
@@ -1403,8 +1403,8 @@ m_move(register struct monst* mtmp, register int after)
 
         cnt = mfndpos(mtmp, poss, info, flag);
         if (cnt == 0) {
-            if (find_defensive(mtmp, TRUE))
-                (void) use_defensive(mtmp);
+            if (find_defensive(mtmp, TRUE) && use_defensive(mtmp))
+                return MMOVE_DONE;
             return MMOVE_NOMOVES;
         }
         chcnt = 0;