the `shop_keeper` function from `shop.c` is missing some return values

shop_keeper.c

int shop_keeper(struct char_data *ch, int cmd, char *arg, char *mob, int type)
{
  char argm[100], buf[MAX_STRING_LENGTH];
  struct char_data *temp_char;
  struct char_data *keeper;
  int shop_nr;
  
  int citizen(struct char_data *ch, int cmd, char *arg, struct char_data *mob, int type);

  if(type == EVENT_DWARVES_STRIKE) {
    ch->generic = DWARVES_STRIKE;
    return;  
  }

  if(type == EVENT_FAMINE) {
    ch->generic = FAMINE;
    return;
  }

  keeper = 0;

  if (!real_roomp(ch->in_room))
    return;
  
  for (temp_char = real_roomp(ch->in_room)->people; (!keeper) && (temp_char) ; 
       temp_char = temp_char->next_in_room)
    if (IS_MOB(temp_char))
      if (mob_index[temp_char->nr].func == shop_keeper)
	keeper = temp_char;
  
  
  
  for(shop_nr=0 ; shop_index[shop_nr].keeper != keeper->nr; shop_nr++);
  
  
  if (!cmd) {
    if (keeper->specials.fighting) {
      return(citizen(keeper,0,"", keeper,0));
    }
  }
  
  if(DoIHateYou(ch) && number(0,3) == 2) {
    act("$n sneers at you.", TRUE, keeper, 0, ch, TO_VICT);
    act("$n sneers at $N.",TRUE, keeper, 0, ch, TO_NOTVICT);
  }

  if((cmd == 56) && (ch->in_room == shop_index[shop_nr].in_room))
    /* Buy */
    {
      shopping_buy(arg,ch,keeper,shop_nr);
      return(TRUE);
    }
  
  if((cmd ==57 ) && (ch->in_room == shop_index[shop_nr].in_room))
    /* Sell */
    {
      shopping_sell(arg,ch,keeper,shop_nr);
      return(TRUE);
    }
  
  if((cmd == 58) && (ch->in_room == shop_index[shop_nr].in_room))
    /* value */
    {
      shopping_value(arg,ch,keeper,shop_nr);
      return(TRUE);
    }
  
  if((cmd == 59) && (ch->in_room == shop_index[shop_nr].in_room))
    /* List */
    {
      shopping_list(arg,ch,keeper,shop_nr);
      return(TRUE);
    }
  
  if ((cmd == 25) || (cmd==70))   /* Kill or Hit */
    {
      only_argument(arg, argm);
      
      if (keeper == get_char_room(argm,ch->in_room))
	{
	  shopping_kill(arg,ch,keeper,shop_nr);
	  return(TRUE);
	}
    } else if ((cmd==84) || (cmd==207) || (cmd==172)) {   /* Cast, recite, use */
      act("$N tells you 'No magic here - kid!'.", FALSE, ch, 0, keeper, TO_CHAR);
      return TRUE;
    }
  
  return(FALSE);
}

/* This is an excerpt from a DikuMUD-derived codebase. DikuMUD was created by Sebastian Hammer, Michael Seifert</a>,
   Hans Henrik Stærfeldt, Tom Madsen, and Katja Nyboe. This code is subject to the DikuMud License, as found at
   https://github.com/jonm/SillyMUD/blob/43344e6dc864de7518c2fc0dbf7b7cf14f5924a2/doc/license.doc
 */