rrsetorder system test succeeds despite of a failure log line

https://gitlab.isc.org/isc-projects/bind9/-/jobs/2589750

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I:rrsetorder:Random selection return 12 of 24 possible orders in 36 samples
I:rrsetorder:failed
I:rrsetorder:Checking order none (cache)
I:rrsetorder:Checking default order (cache)
I:rrsetorder:Default selection return 12 of 24 possible orders in 36 samples
I:rrsetorder:Checking default order no match in rrset-order (cache)
I:rrsetorder:exit status: 0
I:rrsetorder:stopping servers
R:rrsetorder:PASS
E:rrsetorder:2022-06-20T14:30:48+0000
PASS: rrsetorder

Seems to be a missing case of status=$((status+ret)).