simplify get_github_action_eval_result

nixpkgs_review/github.py

@@ -164,20 +164,24 @@ def get_github_action_eval_result(
             return None
 
         for workflow_run in workflow_runs:
-            if workflow_run["name"] == "Eval":
-                artifacts: list[Any] = self.get(
-                    workflow_run["artifacts_url"],
-                )["artifacts"]
-
-                for artifact in artifacts:
-                    if artifact["name"] == "comparison":
-                        changed_paths: Any = self.get_json_from_artifact(
-                            workflow_id=artifact["id"],
-                            json_filename="changed-paths.json",
-                        )
-                        if changed_paths is not None:
-                            if "rebuildsByPlatform" in changed_paths:
-                                return changed_paths["rebuildsByPlatform"]  # type: ignore
+            if workflow_run["name"] != "Eval":
+                continue
+            artifacts: list[Any] = self.get(
+                workflow_run["artifacts_url"],
+            )["artifacts"]
+
+            for artifact in artifacts:
+                if artifact["name"] != "comparison":
+                    continue
+                changed_paths: Any = self.get_json_from_artifact(
+                    workflow_id=artifact["id"],
+                    json_filename="changed-paths.json",
+                )
+                if changed_paths is None:
+                    continue
+                if path := changed_paths.get("rebuildsByPlatform") is not None:
+                    assert isinstance(path, dict)
+                    return path
         return None
 
     def get_borg_eval_gist(self, pr: dict[str, Any]) -> dict[System, set[str]] | None: