Add two missed chunks from the rev. 1.210, for the giant_read() and giant_ioctl().
Add two missed chunks from the rev. 1.210, for the giant_read() and
giant_ioctl().

PR:	kern/122287
MFC after:	3 days

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