ssh-agent: Make public key parsing even robuster
This amends commit f3f3cc70 to take into account of the fact that the key type is prefixed to the decoded blob. Suggested by Mantas Mikulėnas in: https://bugzilla.gnome.org/show_bug.cgi?id=795699
This amends commit f3f3cc70 to take into account of the fact that the key type is prefixed to the decoded blob. Suggested by Mantas Mikulėnas in: https://bugzilla.gnome.org/show_bug.cgi?id=795699