vfs: add missing bits to vdropl_impl

This completes the patch which was originally meant to go in.

Spotted by: mhorne
Fixes: c35ec1efdcb2978b ("vfs: [1/2] fix stalls in vnode reclaim by not
requeieing from vnlru")
Approved by: re (implicit)

(cherry picked from commit 2533b5dc82701ac5e31d0f98dd15362397b2478e)