Fix moves/forward

Clang has new checks for std::move/std::forward correctness, which
catches quite a few "wrong" things where we were making copies of
callback handlers.

Unfortunately, the lambda syntax of

callback{std::forward<Callback>(callback)}

in a capture confuses it, so change usages to
callback = std::forward<Callback>(callback)

to be consistent.

Tested: Redfish service validator passes.

Change-Id: I7a111ec00cf78ecb7d5f5b102c786c1c14d74384
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/virtual_media.hpp b/redfish-core/lib/virtual_media.hpp
index 9784d37..b03f323 100644
--- a/redfish-core/lib/virtual_media.hpp
+++ b/redfish-core/lib/virtual_media.hpp
@@ -98,9 +98,9 @@
     sdbusplus::message::object_path path("/xyz/openbmc_project/VirtualMedia");
     dbus::utility::getManagedObjects(
         service, path,
-        [service, resName, asyncResp,
-         handler](const boost::system::error_code& ec,
-                  const dbus::utility::ManagedObjectType& subtree) {
+        [service, resName, asyncResp, handler = std::move(handler)](
+            const boost::system::error_code& ec,
+            const dbus::utility::ManagedObjectType& subtree) {
         if (ec)
         {
             BMCWEB_LOG_DEBUG("DBUS response error");