this silences the warning from clang-11, like
```
../src/librbd/image/RefreshRequest.cc:34:16: warning: unused variable 'MAX_METADATA_ITEMS' [-Wunused-const-variable]
const uint64_t MAX_METADATA_ITEMS = 128;
^
```
Signed-off-by: Kefu Chai <kchai@redhat.com>
namespace librbd {
namespace image {
-namespace {
-
-const uint64_t MAX_METADATA_ITEMS = 128;
-
-}
-
using util::create_rados_callback;
using util::create_async_context_callback;
using util::create_context_callback;
#define dout_prefix *_dout << "librbd::mirror_snapshot::SetImageStateRequest: " \
<< this << " " << __func__ << ": "
-namespace {
-
-const uint64_t MAX_METADATA_ITEMS = 128;
-
-}
-
namespace librbd {
namespace mirror {
namespace snapshot {