client/Client.cc: fix USE_AFTER_FREE

Don't call put_request() twice, it's already called by
unregister_request()

Fix for:

CID 1405360 (#1 of 1): Use after free (USE_AFTER_FREE)
 deref_arg: Calling put_request dereferences freed pointer request

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

src/client/Client.cc

@@ -1730,7 +1730,6 @@ int Client::make_request(MetaRequest *request,
     r = request->get_abort_code();
     request->item.remove_myself();
     unregister_request(request);
-    put_request(request); // ours
     return r;
   }