This adds support for systematically destroying connections in pam_sm_session_open() even on failure, so that under no circumstances unserved dbus connection are around while the invoking process waits for the session to end. Previously we'd only do this on success, now do it in all cases. This matters since so far we suggested people hook pam_systemd into their pam stacks prefixed with "-", so that login proceeds even if pam_systemd fails. This however means that in an error case our cached connection doesn't get disconnected even if the session then is invoked. This fixes that.
System and Service Manager
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