Fix double-locking issue in DataSharingListener (#5468)

Signed-off-by: Xiaojing Cao <[email protected]>
(cherry picked from commit 059457a)

src/cpp/rtps/DataSharing/DataSharingListener.cpp

@@ -56,18 +56,15 @@ DataSharingListener::~DataSharingListener()
 
 void DataSharingListener::run()
 {
-    std::unique_lock<Segment::mutex> lock(notification_->notification_->notification_mutex, std::defer_lock);
     while (is_running_.load())
     {
         try
         {
-            lock.lock();
+            std::unique_lock<Segment::mutex> lock(notification_->notification_->notification_mutex);
             notification_->notification_->notification_cv.wait(lock, [&]
                     {
                         return !is_running_.load() || notification_->notification_->new_data.load();
                     });
-
-            lock.unlock();
         }
         catch (const boost::interprocess::interprocess_exception& /*e*/)
         {