ConnectionManager: avoid handling shutdown twice

Only process the callback if it was not already done by the tls
shutdown callback.

Change-Id: Iee9b479100268c4815f40f7b5d51b9db7dbb22cd

src/connectionmanager.cpp

@@ -980,7 +980,7 @@ ConnectionManager::Impl::startConnection(const std::shared_ptr<DeviceInfo>& di,
     auto eraseInfo = [w = weak_from_this(), diw=std::weak_ptr(di), vid] {
         if (auto di = diw.lock()) {
             std::unique_lock lk(di->mutex_);
-            di->info.erase(vid);
+            if (di->info.erase(vid)) {
                 auto ops = di->extractPendingOperations(vid, nullptr);
                 if (di->empty()) {
                     if (auto shared = w.lock())
@@ -990,6 +990,7 @@ ConnectionManager::Impl::startConnection(const std::shared_ptr<DeviceInfo>& di,
                 for (const auto& op: ops)
                     op.cb(nullptr, di->deviceId);
             }
+        }
     };
 
     auto info = std::make_shared<ConnectionInfo>();