tests: mark more coroutine_fns

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230309084456.304669-8-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/tests/unit/test-thread-pool.c b/tests/unit/test-thread-pool.c
index 448fbf7..1483e53 100644
--- a/tests/unit/test-thread-pool.c
+++ b/tests/unit/test-thread-pool.c
@@ -70,7 +70,7 @@
     g_assert_cmpint(data.ret, ==, 0);
 }
 
-static void co_test_cb(void *opaque)
+static void coroutine_fn co_test_cb(void *opaque)
 {
     WorkerTestData *data = opaque;