Fix for segfault when attribute resolver used

diff --git a/shibboleth/resolver b/shibboleth/resolver
index 4fe0a84..5f560c7 160000 (submodule)
--- a/shibboleth/resolver
+++ b/shibboleth/resolver
@@ -1 +1 @@
-Subproject commit 4fe0a84018dddc42db76b7d717f3aac8f60895d6
+Subproject commit 5f560c7957b2189ab298142152bf56708708a647