Capture all boost::system::error_codes by ref

Capturing these possibly overloaded values by reference can avoid a copy
in some cases, and it's good to be consistent.

This change was made automatically by grep/sed.

Tested: Code compiles.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Iafeaca2a5dc52f39753b5a3880419d6bc943f81b
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index 736b158..1cedf2d 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -2974,7 +2974,7 @@
         if (protocolName == "SSH")
         {
             getPortNumber(socketPath, [asyncResp, protocolName](
-                                          const boost::system::error_code ec1,
+                                          const boost::system::error_code& ec1,
                                           int portNumber) {
                 if (ec1)
                 {