Redfish: Fix @odata.id formatting issue

On a recent CL the odata.id for drives was being formatted incorrectly.
This change corrects the formatting issue.

Tested:
This change was not tested, and it's correctness should be
self-evident.

Change-Id: Ie530c6d8c4203ad0f733198d5d7ca52cf2f40a52
Signed-off-by: John Edward Broadbent <jebr@google.com>
diff --git a/redfish-core/lib/storage.hpp b/redfish-core/lib/storage.hpp
index e17659d..53763b8 100644
--- a/redfish-core/lib/storage.hpp
+++ b/redfish-core/lib/storage.hpp
@@ -636,8 +636,8 @@
             asyncResp->res.jsonValue["@odata.type"] =
                 "#DriveCollection.DriveCollection";
             asyncResp->res.jsonValue["@odata.id"] =
-                crow::utility::urlFromPieces("redfish", "v1",
-                                             "Chassis" + chassisId + "Drives");
+                crow::utility::urlFromPieces("redfish", "v1", "Chassis",
+                                             chassisId, "Drives");
             asyncResp->res.jsonValue["Name"] = "Drive Collection";
 
             // Association lambda