coroutine: Use Coroutine typedef name instead of structure tag

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221221131435.3851212-6-armbru@redhat.com>
diff --git a/util/async.c b/util/async.c
index 14d63b3..0657b75 100644
--- a/util/async.c
+++ b/util/async.c
@@ -640,7 +640,7 @@
     }
 }
 
-void aio_co_wake(struct Coroutine *co)
+void aio_co_wake(Coroutine *co)
 {
     AioContext *ctx;
 
@@ -653,7 +653,7 @@
     aio_co_enter(ctx, co);
 }
 
-void aio_co_enter(AioContext *ctx, struct Coroutine *co)
+void aio_co_enter(AioContext *ctx, Coroutine *co)
 {
     if (ctx != qemu_get_current_aio_context()) {
         aio_co_schedule(ctx, co);