MFC r179722: In cd9660_readdir vop, always initialize the idp->uio_off member.
MFC r179722:
In cd9660_readdir vop, always initialize the idp->uio_off member.

PR:	122925

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