Repair last commit's new wait_for_catchup() call.

Noah Misch <noah@leadboat.com>

Commit: aca51181baf9ec3ddcac6707bf6a6a5014f7543b
Author: Noah Misch <noah@leadboat.com>
Date: 2020-04-14T04:10:06Z
Releases: 10.13
Repair last commit's new wait_for_catchup() call.

The function had a different API in v10.  Per buildfarm.

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