rust: alloc: replace `Vec::set_len` with `inc_len`

Rename `set_len` to `inc_len` and simplify its safety contract.

Note that the usage in `CString::try_from_fmt` remains correct as the
receiver is known to have `len == 0`.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://lore.kernel.org/r/20250416-vec-set-len-v4-4-112b222604cd@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs
index 80a9782b1c6e..e4882f113d79 100644
--- a/rust/kernel/uaccess.rs
+++ b/rust/kernel/uaccess.rs
@@ -290,7 +290,7 @@ impl UserSliceReader {
 
         // SAFETY: Since the call to `read_raw` was successful, so the next `len` bytes of the
         // vector have been initialized.
-        unsafe { buf.set_len(buf.len() + len) };
+        unsafe { buf.inc_len(len) };
         Ok(())
     }
 }