test-asn1: Don't leak 'asn' in test_create_quark()

https://bugzilla.gnome.org/show_bug.cgi?id=738508
egg/test-dn: Don't leak GBytes created in test_dn_value()

https://bugzilla.gnome.org/show_bug.cgi?id=738508
egg-asn1x: Fix memory leak in egg_asn1x_set_any_raw()

In error cases, the Atlv variable 'tlv' which was created in this
function is not going to be used, so we must free it before returning.

https://bugzilla.gnome.org/show_bug.cgi?id=738508