Add a `Debug` implementation for `StoreError<T>` to enable better error
reporting and debugging. The implementation only displays the `error`
field and omits the `value` field, as `T` may not implement `Debug`.

Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Acked-by: Tamir Duberstein <tamird@gmail.com>
Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/xarray.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/xarray.rs b/rust/kernel/xarray.rs
index b80fb7a262d0..d54942aeb201 100644
--- a/rust/kernel/xarray.rs
+++ b/rust/kernel/xarray.rs
@@ -193,6 +193,14 @@ pub struct StoreError<T> {
     pub value: T,
 }
 
+impl<T> kernel::fmt::Debug for StoreError<T> {
+    fn fmt(&self, f: &mut kernel::fmt::Formatter<'_>) -> kernel::fmt::Result {
+        f.debug_struct("StoreError")
+            .field("error", &self.error)
+            .finish()
+    }
+}
+
 impl<T> From<StoreError<T>> for Error {
     #[inline]
     fn from(value: StoreError<T>) -> Self {

-- 
2.51.2