Add a flag to not output anything when xmllint succeeded

3 jobs for hhb-master-patch-18778 in 3 minutes and 33 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #1164546
clang:asan

00:03:33

passed #1164547
clang:msan

00:03:09

passed #1164545
gcc

00:02:01