[no gbp] Fixes a small mistake with helper proc (#93748)

code/__HELPERS/_lists.dm

@@ -546,21 +546,21 @@
 * e.g. pick_n(list_of_stuff, 10) would return a list of 10 items from the list, chosen randomly.
 */
 /proc/pick_n(list/list_to_pick, n)
-	var/list_to_pick_length = length(list_to_pick)
-	if(!islist(list_to_pick) || !list_to_pick_length || n <= 0)
+	var/list_to_pick_length
+	if(islist(list_to_pick))
+		list_to_pick_length = length(list_to_pick)
+
+	if(!list_to_pick_length || n <= 0)
 		return list()
 
-	/// The final list that gets returned
-	var/list/result
 	/// length of our list_to_pick
 	n = min(n, list_to_pick_length)
 
 	// Shuffle and slice the first n indices
 	var/list/copy_to_shuffle = list_to_pick.Copy()
-	shuffle(copy_to_shuffle)
-	result = copy_to_shuffle.Copy(1, n + 1)
+	shuffle_inplace(copy_to_shuffle)
 
-	return result
+	return copy_to_shuffle.Copy(1, n + 1)
 
 /**
  * Given a list, return a copy where values without defined weights are given weight 1.

code/modules/events/space_vines/vine_event.dm

@@ -36,7 +36,7 @@
 	else
 		var/obj/structure/spacevine/vine = new()
 		var/list/floor_candidates = list()
-		for(var/area/station/hallway/area in shuffle(GLOB.areas.Copy()))
+		for(var/area/station/hallway/area in shuffle(GLOB.areas))
 			for(var/turf/open/floor in area.get_turfs_from_all_zlevels())
 				if(isopenspaceturf(floor))
 					continue