Fix merge conflict in session

9f217c26f58c0a99c18e7cac7b095dcf6068562d
had a merge conflict that was resolved incorrectly with
25b54dba775b31021a3a4677eb79e9771bcb97f7

The line returning the cookie session got dropped in that merge
conflict. Restore it.

Tested: Webui can log in, and cookie auth works again.

Ideally in the future we'd have some tests for places like this where
we've gone outside the redfish spec.

Change-Id: I7740e19dac4d0dae5c5c9b27a5b8699a4751fd6f
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/include/authentication.hpp b/include/authentication.hpp
index 6483365..5f43f0a 100644
--- a/include/authentication.hpp
+++ b/include/authentication.hpp
@@ -177,6 +177,7 @@
                 }
             }
         }
+        return sessionOut;
     }
     return nullptr;
 }