tests/unit: Remove debug statements in test-nested-aio-poll.c

We have been running this test for almost a year; it
is safe to remove its debug statements, which clutter
CI jobs output:

  ▶  88/100 /nested-aio-poll                      OK
  io_read 0x16bb26158
  io_poll_true 0x16bb26158
  > io_poll_ready
  io_read 0x16bb26164
  < io_poll_ready
  io_poll_true 0x16bb26158
  io_poll_false 0x16bb26164
  > io_poll_ready
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_poll_false 0x16bb26164
  io_read 0x16bb26164
  < io_poll_ready
  88/100 qemu:unit / test-nested-aio-poll        OK

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240422112246.83812-1-philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/unit/test-nested-aio-poll.c

@@ -30,28 +30,23 @@ typedef struct {
 
 static void io_read(EventNotifier *notifier)
 {
-    fprintf(stderr, "%s %p\n", __func__, notifier);
     event_notifier_test_and_clear(notifier);
 }
 
 static bool io_poll_true(void *opaque)
 {
-    fprintf(stderr, "%s %p\n", __func__, opaque);
     return true;
 }
 
 static bool io_poll_false(void *opaque)
 {
-    fprintf(stderr, "%s %p\n", __func__, opaque);
     return false;
 }
 
 static void io_poll_ready(EventNotifier *notifier)
 {
     TestData *td = container_of(notifier, TestData, poll_notifier);
 
-    fprintf(stderr, "> %s\n", __func__);
-
     g_assert(!td->nested);
     td->nested = true;
 
@@ -62,8 +57,6 @@ static void io_poll_ready(EventNotifier *notifier)
     g_assert(aio_poll(td->ctx, true));
 
     td->nested = false;
-
-    fprintf(stderr, "< %s\n", __func__);
 }
 
 /* dummy_notifier never triggers */