Optimized @condition decorator a bit.

This removes unnecessary get_last_modified() hook.

django/views/decorators/http.py

@@ -86,19 +86,15 @@ def condition(etag_func=None, last_modified_func=None):
         @wraps(func)
         def inner(request, *args, **kwargs):
             # Compute values (if any) for the requested resource.
-            def get_last_modified():
+            res_last_modified = None
             if last_modified_func:
-                    dt = last_modified_func(request, *args, **kwargs)
-                    if dt:
+                if dt := last_modified_func(request, *args, **kwargs):
                     if not timezone.is_aware(dt):
                         dt = timezone.make_aware(dt, datetime.timezone.utc)
-                        return int(dt.timestamp())
-
+                    res_last_modified = int(dt.timestamp())
             # The value from etag_func() could be quoted or unquoted.
             res_etag = etag_func(request, *args, **kwargs) if etag_func else None
             res_etag = quote_etag(res_etag) if res_etag is not None else None
-            res_last_modified = get_last_modified()
-
             response = get_conditional_response(
                 request,
                 etag=res_etag,