qa: correct json lookup for new lock path output

Fixes: https://tracker.ceph.com/issues/66355
Fixes: 3552fc5
Signed-off-by: Patrick Donnelly <[email protected]>

Author: batrick

qa/tasks/cephfs/test_subvolume.py

@@ -193,7 +193,7 @@ def test_subvolume_replicated(self):
         op = self.fs.rank_tell("lock", "path", "/dir1/dir2", "snap:r", rank=1)
         p = self.mount_a.setfattr("dir1/dir2", "ceph.dir.subvolume", "1", wait=False)
         sleep(2)
-        reqid = self._reqid_tostr(op['op']['reqid'])
+        reqid = self._reqid_tostr(op['reqid'])
         self.fs.kill_op(reqid, rank=1)
         p.wait()