fix clippy::map_flatten

crates/ide/src/annotations.rs

@@ -170,10 +170,9 @@ pub(crate) fn resolve_annotation(db: &RootDatabase, mut annotation: Annotation)
                 result
                     .into_iter()
                     .flat_map(|res| res.references)
-                    .map(|(file_id, access)| {
+                    .flat_map(|(file_id, access)| {
                         access.into_iter().map(move |(range, _)| FileRange { file_id, range })
                     })
-                    .flatten()
                     .collect()
             });
         }