Fix lint errors

Author: nineteendo

sphinxext/opengraph/__init__.py

@@ -4,7 +4,7 @@
 import posixpath
 from pathlib import Path
 from typing import TYPE_CHECKING
-from urllib.parse import urljoin, urlparse, urlsplit, urlunsplit
+from urllib.parse import urljoin, urlparse
 
 from docutils import nodes
 
@@ -254,9 +254,8 @@ def ambient_site_url() -> str:
     # or defines the ``html_baseurl`` variable in conf.py
     if rtd_canonical_url := os.getenv('READTHEDOCS_CANONICAL_URL'):
         return rtd_canonical_url
-    else:
-        msg = 'ReadTheDocs did not provide a valid canonical URL!'
-        raise RuntimeError(msg)
+    msg = 'ReadTheDocs did not provide a valid canonical URL!'
+    raise RuntimeError(msg)
 
 
 def social_card_for_page(