Updates keyringer: aac16ab Fix re-encryption when the secret hass NULL bytes

diff --git a/keyringer b/keyringer
index a3c913dec62cb098b3234bfaec22492ba8979119..aac16ab2cbd31d783f98a1ffe814a363886f74f4 160000 (submodule)
--- a/keyringer
+++ b/keyringer
@@ -1 +1 @@
-Subproject commit a3c913dec62cb098b3234bfaec22492ba8979119
+Subproject commit aac16ab2cbd31d783f98a1ffe814a363886f74f4