[PATCH] rust: workqueue: Enable execution of doctests

[Dirk Behme <dirk.behme@gmail.com>]

Having the Rust doctests enabled these workqueue tests are built but not
executed as the final callers of the print_*() functions are missing.
Add them.

The result is

     # rust_doctest_kernel_workqueue_rs_0.location: 
rust/kernel/workqueue.rs:35
rust_doctests_kernel: The value is: 42
     ok 94 rust_doctest_kernel_workqueue_rs_0
     # rust_doctest_kernel_workqueue_rs_3.location: 
rust/kernel/workqueue.rs:78
rust_doctests_kernel: The value is: 24
rust_doctests_kernel: The second value is: 42
     ok 97 rust_doctest_kernel_workqueue_rs_3

Without this change the "The value ..." outputs are not there meaning 
that this
test code is not run.

Cc: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
---
  rust/kernel/workqueue.rs | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 10d2bc62e2cf..ba0f397f8b8b 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -69,6 +69,8 @@
  //! fn print_later(val: Arc<MyStruct>) {
  //!     let _ = workqueue::system().enqueue(val);
  //! }
+//!
+//! # let _ = print_later(MyStruct::new(42).unwrap());
  //! ```
  //!
  //! The following example shows how multiple `work_struct` fields 
can be used:
@@ -126,6 +128,9 @@
  //! fn print_2_later(val: Arc<MyStruct>) {
  //!     let _ = workqueue::system().enqueue::<Arc<MyStruct>, 2>(val);
  //! }
+//!
+//! # let _ = print_1_later(MyStruct::new(24, 25).unwrap());
+//! # let _ = print_2_later(MyStruct::new(41, 42).unwrap());
  //! ```
  //!
  //! C header: 
[`include/linux/workqueue.h`](srctree/include/linux/workqueue.h)
-- 
2.34.1