crimson/tools/store_nbd: mark padding variable with [[maybe_unused]]

also silences -Wunused-variable warning from GCC

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/crimson/tools/store_nbd/store-nbd.cc b/src/crimson/tools/store_nbd/store-nbd.cc
index 17f8cfa1d43b818735f70a00b97ae0f23c1b5bac..149373601dce14744da0a3819c912b2536ad4418 100644 (file)
--- a/src/crimson/tools/store_nbd/store-nbd.cc
+++ b/src/crimson/tools/store_nbd/store-nbd.cc
@@ -321,7 +321,7 @@ class nbd_oldstyle_negotiation_t {
   uint64_t magic2 = seastar::cpu_to_be(0x00420281861253);  // "IHAVEOPT"
   uint64_t size = 0;
   uint32_t flags = seastar::cpu_to_be(0);
-  char reserved[124] = {0};
+  [[maybe_unused]] char reserved[124] = {0};
 
 public:
   nbd_oldstyle_negotiation_t(uint64_t size, uint32_t flags)