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/pcie.hpp b/redfish-core/lib/pcie.hpp
index e8da219..9392916 100644
--- a/redfish-core/lib/pcie.hpp
+++ b/redfish-core/lib/pcie.hpp
@@ -221,7 +221,7 @@
     dbus::utility::getAssociatedSubTreePaths(
         associationPath, sdbusplus::message::object_path(inventoryPath), 0,
         pcieSlotInterface,
-        [callback, asyncResp, pcieDevicePath](
+        [callback = std::move(callback), asyncResp, pcieDevicePath](
             const boost::system::error_code& ec,
             const dbus::utility::MapperGetSubTreePathsResponse& endpoints) {
         if (ec)