fix another case of bad err shadowing

activity.go

@@ -288,7 +288,8 @@ var boxofboxes = cache.New(cache.Options{Filler: func(ident string) (*Box, bool)
 	err := row.Scan(&info)
 	if err != nil {
 		log.Printf("need to get boxes for %s", ident)
-		j, err := GetJunk(ident)
+		var j junk.Junk
+		j, err = GetJunk(ident)
 		if err != nil {
 			log.Printf("error getting boxes: %s", err)
 			return nil, false