[task_scheduler] Drive-by err check cleanup
[task_scheduler] Drive-by err check cleanup

Change-Id: I65f20af21f88feb15d2b455dd91a5cddc0888d49
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/258557
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Auto-Submit: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot