For cd9660_ioctl, check for recycled vnode after locking it.
For cd9660_ioctl, check for recycled vnode after locking it.

Noted by:	Jaakko Heinonen <jh saunalahti fi>
MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase