Merge pull request #12037 from bluetech/fixtures-getnextfixturedef-parent

fixtures: remove unneeded optimization from `_getnextfixturedef`

Author: bluetech

src/_pytest/fixtures.py

@@ -413,9 +413,7 @@ def _getnextfixturedef(self, argname: str) -> "FixtureDef[Any]":
             # We arrive here because of a dynamic call to
             # getfixturevalue(argname) usage which was naturally
             # not known at parsing/collection time.
-            parent = self._pyfuncitem.parent
-            assert parent is not None
-            fixturedefs = self._fixturemanager.getfixturedefs(argname, parent)
+            fixturedefs = self._fixturemanager.getfixturedefs(argname, self._pyfuncitem)
             if fixturedefs is not None:
                 self._arg2fixturedefs[argname] = fixturedefs
         # No fixtures defined with this name.