Fix examples

Signed-off-by: Michael X. Grey <[email protected]>

Author: mxgrey

examples/minimal_pub_sub/src/minimal_two_nodes.rs

@@ -11,7 +11,7 @@ use anyhow::{Error, Result};
 struct MinimalSubscriber {
     num_messages: AtomicU32,
     node: rclrs::Node,
-    subscription: Mutex<Option<Arc<rclrs::Subscription<std_msgs::msg::String>>>>,
+    subscription: Mutex<Option<rclrs::Subscription<std_msgs::msg::String>>>,
 }
 
 impl MinimalSubscriber {

examples/rust_pubsub/src/simple_publisher.rs

@@ -3,7 +3,7 @@ use std::{sync::Arc, thread, time::Duration};
 use std_msgs::msg::String as StringMsg;
 struct SimplePublisherNode {
     node: Node,
-    _publisher: Arc<Publisher<StringMsg>>,
+    _publisher: Publisher<StringMsg>,
 }
 impl SimplePublisherNode {
     fn new(context: &Context) -> Result<Self, RclrsError> {

examples/rust_pubsub/src/simple_subscriber.rs

@@ -8,7 +8,7 @@ use std::{
 use std_msgs::msg::String as StringMsg;
 pub struct SimpleSubscriptionNode {
     node: Node,
-    _subscriber: Arc<Subscription<StringMsg>>,
+    _subscriber: Subscription<StringMsg>,
     data: Arc<Mutex<Option<StringMsg>>>,
 }
 impl SimpleSubscriptionNode {