[PATCH] rust: faux: fix C header link

[Miguel Ojeda <ojeda@kernel.org>]

Starting with Rust 1.91.0 (expected 2025-10-30), `rustdoc` has improved
some false negatives around intra-doc links [1], and it found a broken
intra-doc link we currently have:

    error: unresolved link to `include/linux/device/faux.h`
     --> rust/kernel/faux.rs:7:17
      |
    7 | //! C header: [`include/linux/device/faux.h`]
      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no item named `include/linux/device/faux.h` in scope
      |
      = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
      = note: `-D rustdoc::broken-intra-doc-links` implied by `-D warnings`
      = help: to override `-D warnings` add `#[allow(rustdoc::broken_intra_doc_links)]`

Our `srctree/` C header links are not intra-doc links, thus they need
the link destination.

Thus fix it.

Cc: stable@vger.kernel.org
Link: https://github.com/rust-lang/rust/pull/132748 [1]
Fixes: 78418f300d39 ("rust/kernel: Add faux device bindings")
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
It may have been in 1.90, but the beta branch does not have it, and the
rollup PR says 1.91, unlike the PR itself, so I picked 1.91. It happened
just after the version bump to 1.91, so it may have to do with that.

 rust/kernel/faux.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/faux.rs b/rust/kernel/faux.rs
index 7a906099993f..7fe2dd197e37 100644
--- a/rust/kernel/faux.rs
+++ b/rust/kernel/faux.rs
@@ -4,7 +4,7 @@
 //!
 //! This module provides bindings for working with faux devices in kernel modules.
 //!
-//! C header: [`include/linux/device/faux.h`]
+//! C header: [`include/linux/device/faux.h`](srctree/include/linux/device/faux.h)

 use crate::{bindings, device, error::code::*, prelude::*};
 use core::ptr::{addr_of_mut, null, null_mut, NonNull};

base-commit: d2eedaa3909be9102d648a4a0a50ccf64f96c54f
--
2.50.1