[COMMIT seastar master] core/units: include what we use

[Commit Bot]

From: Kefu Chai <kefu...@scylladb.com>
Committer: Avi Kivity <a...@scylladb.com>
Branch: master

core/units: include what we use

a header file is supposed to be self-contained. as `size_t` is defined
by cstddef, let's include it.

Signed-off-by: Kefu Chai <kefu...@scylladb.com>

---
diff --git a/include/seastar/core/units.hh b/include/seastar/core/units.hh
--- a/include/seastar/core/units.hh
+++ b/include/seastar/core/units.hh
@@ -21,6 +21,8 @@

#pragma once

+#include <cstddef>
+
namespace seastar {

static constexpr size_t KB = 1 << 10;