Bug: Duplicate call to circuit_mark_for_close

Caught today at a bare metal relay 4FC26DC244109105AE131628BDB0C84F2D710941 (hardened Gentoo Linux):

Jun 15 20:19:18.000 [warn] Error relaying cell across rendezvous; closing circuits
Jun 15 20:19:18.000 [warn] circuit_mark_for_close_(): Bug: Duplicate call to circuit_mark_for_close at src/core/or/command.c:577 (first at src/core/or/relay.c:343) (on Tor 0.4.9.0-alpha-dev c7514b96641f2be1)

Before and after that no related logs. This happened either very rarely or for the first time IIRC.

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