message: Update result.rs
  Adding the remaining ReturnCode values that exist in [tock/returncode.rs](https://github.com/tock/tock/blob/master/kernel/src/returncode.rs)
diff: @@ -25,6 +25,14 @@ pub const SUCCESS: isize = 0;
  pub const FAIL: isize = -1;
  pub const EBUSY: isize = -2;
  pub const EALREADY: isize = -3;
  +pub const EOFF: isize = -4;
  +pub const ERESERVE: isize = -5;
  pub const EINVAL: isize = -6;
  pub const ESIZE: isize = -7;
  +pub const ECANCEL: isize = -8;
  pub const ENOMEM: isize = -9;
  +pub const ENOSUPPORT: isize = -10;
  +pub const ENODEVICE: isize = -11;
  +pub const EUNINSTALLED: isize = -12;
  +pub const ENOACK: isize = -13;
  +
  