[PATCH v2] 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>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Trevor Gross <tmgross@umich.edu>
Cc: Tejun Heo <tj@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
---

Changes in v2:
  - Drop 'let _ ='
  - Drop empty line
  - Add additional maintainers into Cc
  - Drop newline in commit message
  - Add Reviewed-by from v1

 rust/kernel/workqueue.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 10d2bc62e2cf..3755c8e5e9ea 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -69,6 +69,7 @@
 //! fn print_later(val: Arc<MyStruct>) {
 //!     let _ = workqueue::system().enqueue(val);
 //! }
+//! # print_later(MyStruct::new(42).unwrap());
 //! ```
 //!
 //! The following example shows how multiple `work_struct` fields can
be used:
@@ -126,6 +127,8 @@
 //! fn print_2_later(val: Arc<MyStruct>) {
 //!     let _ = workqueue::system().enqueue::<Arc<MyStruct>, 2>(val);
 //! }
+//! # print_1_later(MyStruct::new(24, 25).unwrap());
+//! # print_2_later(MyStruct::new(41, 42).unwrap());
 //! ```
 //!
 //! C header:
[`include/linux/workqueue.h`](srctree/include/linux/workqueue.h)
-- 
2.34.1