[PATCH v1 11/28] rust: prelude: add `error::code::*` constant items

[Miguel Ojeda <ojeda@kernel.org>]

From: Wedson Almeida Filho <wedsonaf@gmail.com>

It is convenient to have all the `Error` constant items (such as
`EINVAL`) available as-is everywhere (i.e. for code using the kernel
prelude such as kernel modules).

Therefore, add all of them to the prelude.

For instance, this allows to write `Err(EINVAL)` to create
a kernel `Result`:

    fn f() -> Result<...> {
        ...
        Err(EINVAL)
    }

Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/prelude.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
index 7c4c35bf3c66..1e08b08e9420 100644
--- a/rust/kernel/prelude.rs
+++ b/rust/kernel/prelude.rs
@@ -19,6 +19,6 @@ pub use macros::{module, vtable};
 
 pub use super::{pr_alert, pr_crit, pr_debug, pr_emerg, pr_err, pr_info, pr_notice, pr_warn};
 
-pub use super::error::{Error, Result};
+pub use super::error::{code::*, Error, Result};
 
 pub use super::ThisModule;
-- 
2.38.1