rgw/notify: add copy ctor to token waiter

Signed-off-by: Yuval Lifshitz <[email protected]>

Author: yuvalif

src/rgw/driver/rados/rgw_notify.cc

@@ -154,6 +154,9 @@ class Manager : public DoutPrefixProvider {
 
     struct token {
       tokens_waiter& waiter;
+      token(const token& other) : waiter(other.waiter) {
+        ++waiter.pending_tokens;
+      }
       token(tokens_waiter& _waiter) : waiter(_waiter) {
         ++waiter.pending_tokens;
       }