release wish history memory

The memory leak only happened at end of game so wasn't a big deal.

include/extern.h

@@ -3989,6 +3989,7 @@ extern char *item_what(int);
 extern int destroy_items(struct monst *, int, int) NONNULLARG1;
 extern int resist(struct monst *, char, int, int) NONNULLARG1;
 extern void wish_history_add(char *);
+extern void wish_history_flush(void);
 extern void makewish(void);
 extern const char *flash_str(int, boolean) NONNULL;
 

src/save.c

@@ -1111,6 +1111,7 @@ freedynamicdata(void)
     cmdq_clear(CQ_REPEAT);
     cmdbind_freeall();
     free_tutorial(); /* (only needed if quitting while in tutorial) */
+    wish_history_flush();
 
     /* per-turn data, but might get added to when freeing other stuff */
     dobjsfree(); /* really free deleted objects */

src/zap.c

@@ -6240,13 +6240,28 @@ wish_history_add(char *buf)
 
         if (wish_history[idx])
             free(wish_history[idx]);
-        wish_history[idx] = (char *)alloc(strlen(buf) + 1);
+        wish_history[idx] = (char *) alloc(strlen(buf) + 1);
         strcpy(wish_history[idx], buf);
         wish_history_idx = (wish_history_idx + 1) % MAX_WISH_HISTORY;
     }
 #endif /* DEBUG */
 }
 
+/* release any old wish text; called from freedynamicdata(save.c) */
+void
+wish_history_flush(void)
+{
+#ifdef DEBUG
+    int idx;
+
+    for (idx = 0; idx < MAX_WISH_HISTORY; ++idx) {
+        if (wish_history[idx])
+            free((genericptr_t) wish_history[idx]), wish_history[idx] = NULL;
+    }
+    wish_history_idx = 0;
+#endif
+}
+
 /* shows menu of previous wishes, copies selected into buf, max BUFSZ len.
    buf is not modified, if nothing was selected. */
 staticfn void