Remove the variable "size" from reply_nttrans

Remove the variable "size" from reply_nttrans

This converts the range checks for the setup[] array to rely on req->wct being
set correctly in init_smb_request. As that already verifies the vwv array to be
in the range of the smb_request inbuf, we don't have to do overflow checks here
anymore.

Jeremy, please check thoroughly! :-)

Thanks,

Volker