Given the previously reserved certificate descriptor (cd)
this associates the given key with that descriptor
cd - A certificate descriptor previously reserved with
reserve_cd. Note that the array lock must be
held between the time reserve_cd and make_cd
is called. If cd is not reserved when this
function is called then an error will be returned.
key - The key to associate with this cd. Must not be NULL.
It is assumed that the cd field of the key has already
been set to cd.
0 - success
-1 - failure