[Firehol-devs] Build fail for https://github.com/firehol/netdata master

[FireHOL builds]

Your build log is below...
--
Bringing mirrors up to date...
>From https://github.com/firehol/netdata
   da32553..32b957a  master     -> master
fatal: Unable to create '/home/firehol/mirrors/netdata.git/refs/pull/403/merge.lock': File exists.

If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.
Unexpected end of command stream
error: Could not fetch origin