refactor: reduce quality findings

infrastructure/src/cas/filesystem.rs

@@ -83,11 +83,13 @@ impl CasRepository for FileSystemCasRepository {
 
     async fn get(&self, id: &ObjectId) -> bat_core::Result<Vec<u8>> {
         let hash = Self::parse_object_id(id)?;
-        self.engine()
+        let data = self
+            .engine()
             .await?
             .get(&hash)
             .await
-            .map_err(Self::map_error)
+            .map_err(Self::map_error)?;
+        Ok(data)
     }
 
     async fn exists(&self, id: &ObjectId) -> bool {
@@ -175,10 +177,8 @@ mod tests {
         assert_eq!(repo.gc().await.unwrap(), 1);
 
         assert!(!repo.exists(&id).await);
-        assert!(matches!(
-            repo.get(&id).await,
-            Err(bat_core::Error::NotFound(_))
-        ));
+        let missing = repo.get(&id).await;
+        assert!(matches!(missing, Err(bat_core::Error::NotFound(_))));
     }
 
     #[tokio::test]