Avoid too many return statements in a function

ssg/build_ovals.py

@@ -357,8 +357,6 @@ def get_checks_from_benchmark(
 
 
 def _process_oval_file(filename, oval_dir, already_loaded, env_yaml):
-    if not filename.endswith(".xml"):
-        return None
     oval_file_path = os.path.join(oval_dir, filename)
     if "checks_from_templates" in oval_dir:
         with open(oval_file_path, "r") as f:
@@ -384,6 +382,8 @@ def _process_directory(oval_dir, env_yaml, already_loaded):
     oval_version = utils.required_key(env_yaml, "target_oval_version_str")
     # sort the files to make output deterministic
     for filename in sorted(os.listdir(oval_dir)):
+        if not filename.endswith(".xml"):
+            continue
         xml_content = _process_oval_file(
             filename, oval_dir, already_loaded, env_yaml)
         if not xml_content: