chore: fix question_mark lint error

Author: kezhuw

src/session/watch.rs

@@ -366,15 +366,9 @@ impl WatchManager {
     }
 
     fn try_remove_watcher(&mut self, watcher_id: WatcherId, depot: &Depot) -> Option<(&str, WatchMode)> {
-        let Some(path) = self.watching_paths.remove(&watcher_id) else {
-            return None;
-        };
-        let Some(watch) = self.watches.get_mut(path) else {
-            return None;
-        };
-        let Some(watcher) = watch.remove_watcher(watcher_id) else {
-            return None;
-        };
+        let path = self.watching_paths.remove(&watcher_id)?;
+        let watch = self.watches.get_mut(path)?;
+        let watcher = watch.remove_watcher(watcher_id)?;
         let mut mode = watcher.kind.into_remove_mode();
         if watch.is_empty() {
             self.remove_watches(path);