clean code with clippy

src/model/trip.rs

@@ -140,7 +140,7 @@ FROM user_trip WHERE trip_details_id = (SELECT trip_details_id FROM trip WHERE i
         notes: Option<&str>,
         trip_type: Option<i64>, //TODO: Move to `TripType`
     ) -> Result<(), TripUpdateError> {
-        if !trip.is_trip_from_user(cox.id).await {
+        if !trip.is_trip_from_user(cox.id) {
             return Err(TripUpdateError::NotYourTrip);
         }
 
@@ -194,7 +194,7 @@ FROM user_trip WHERE trip_details_id = (SELECT trip_details_id FROM trip WHERE i
             return Err(TripDeleteError::SomebodyAlreadyRegistered);
         }
 
-        if !self.is_trip_from_user(user.id).await {
+        if !self.is_trip_from_user(user.id) {
             return Err(TripDeleteError::NotYourTrip);
         }
 
@@ -210,7 +210,7 @@ FROM user_trip WHERE trip_details_id = (SELECT trip_details_id FROM trip WHERE i
         Ok(())
     }
 
-    async fn is_trip_from_user(&self, user_id: i64) -> bool {
+    fn is_trip_from_user(&self, user_id: i64) -> bool {
         self.cox_id == user_id
     }
 }