Add rust lint CI job.

rust/sys/yellowstone/src/server.rs

@@ -57,9 +57,8 @@ impl YellowstoneServerContext {
 
     pub fn wait(&self, service: &str) -> Result<(), ZError> {
         loop {
-            match self.service_map.lock().get(service) {
-                Some(_) => return Ok(()),
-                None => {}
+            if self.service_map.lock().get(service).is_some() {
+                return Ok(());
             }
             self.registration_semaphore.wait().unwrap();
         }