Removed redundant condition in QuerySet.resolve_expression().

django/db/models/query.py

@@ -1136,8 +1136,7 @@ class QuerySet:
         if self._fields and len(self._fields) > 1:
             # values() queryset can only be used as nested queries
             # if they are set up to select only a single field.
-            if len(self._fields) > 1:
-                raise TypeError('Cannot use multi-field values as a filter value.')
+            raise TypeError('Cannot use multi-field values as a filter value.')
         query = self.query.resolve_expression(*args, **kwargs)
         query._db = self._db
         return query