all: wrap up unsafe { nil } (p. 3)

vlib/datatypes/fsm/fsm.v

@@ -14,7 +14,7 @@ mut:
 struct Transition {
 mut:
 	to                string
-	condition_handler ConditionFn = voidptr(0)
+	condition_handler ConditionFn = unsafe { nil }
 }
 
 pub struct StateMachine {

vlib/datatypes/linked_list.v

@@ -87,14 +87,14 @@ pub fn (mut list LinkedList<T>) pop() ?T {
 	if unsafe { node.next == 0 } {
 		// first node case
 		// set to null
-		list.head = voidptr(0)
+		list.head = unsafe { nil }
 	} else {
 		for unsafe { node.next.next != 0 } {
 			node = node.next
 		}
 		to_return = node.next.data
 		// set to null
-		node.next = voidptr(0)
+		node.next = unsafe { nil }
 	}
 	list.len -= 1
 	return to_return