Fix addressing deleted trap when helping monster out of a pit

Move reward_untrap before fill_pit, as the trap may get deleted.

doc/fixes36.3

@@ -182,6 +182,7 @@ fix firing attached iron ball when swallowed causing a sanity error
 fix vault guard impossible when he could not relocate in certain situation
 fix temple priests or shopkeepers moving over other monsters
 fix hero still hiding under a statue shattered by a land mine
+fix helping a monster out of a pit addressing a deleted trap
 
 
 Fixes to Post-3.6.2 Problems that Were Exposed Via git Repository

src/trap.c

@@ -4346,8 +4346,8 @@ struct trap *ttmp;
 
     You("pull %s out of the pit.", mon_nam(mtmp));
     mtmp->mtrapped = 0;
-    fill_pit(mtmp->mx, mtmp->my);
     reward_untrap(ttmp, mtmp);
+    fill_pit(mtmp->mx, mtmp->my);
     return 1;
 }