Apply suggestions from code review

Co-authored-by: Nikolai Morin <nnmmgit@gmail.com>

Author: christopherjreid

rclrs/src/wait.rs

@@ -24,10 +24,9 @@ use std::time::Duration;
 use std::vec::Vec;
 
 mod exclusivity_guard;
-use exclusivity_guard::*;
-
 mod guard_condition;
-use guard_condition::*;
+use exclusivity_guard::*;
+pub use guard_condition::*;
 
 /// A struct for waiting on subscriptions and other waitable entities to become ready.
 pub struct WaitSet {