[PATCH v4 4/7] rust: str: make `from_bytes_with_nul_unchecked_mut` const

[Alexandre Courbot]

This method was probably kept non-const due to the absence of the
`const_mut_refs` feature, but it has been enabled since the introduction
of this code (and stabilized with Rust 1.83). Thus, make it const to
match its non-const counterpart.

Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
 rust/kernel/str.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index a927db8e079c3597860880947a03959e1d6d712e..2640a050847e64bfd18c127a5a83b93f01f036bc 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -288,7 +288,7 @@ pub const fn from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, CStrConvertError
     /// `bytes` *must* end with a `NUL` byte, and should only have a single
     /// `NUL` byte (or the string will be truncated).
     #[inline]
-    pub unsafe fn from_bytes_with_nul_unchecked_mut(bytes: &mut [u8]) -> &mut CStr {
+    pub const unsafe fn from_bytes_with_nul_unchecked_mut(bytes: &mut [u8]) -> &mut CStr {
         // SAFETY: Properties of `bytes` guaranteed by the safety precondition.
         unsafe { &mut *(bytes as *mut [u8] as *mut CStr) }
     }

-- 
2.49.0