fs_mgr: fs_mgr_overlayfs_teardown_one failure to teardown scratch

If fs_mgr_overlayfs_teardown_one can not access the top directory,
then we should teardown the scratch volume.

Test: manual
Bug: 109821105
Change-Id: Ic86e10f1af1be354242fc004a95cac92d77619a6
1 file changed