async_hooks: don't set hook_fields[kTotals] to 0

[danbev]

This commit removes the setting of hook_field[kTotals] to szero in
AsyncHook's enable function.

As far as I can tell this would not be required if the setting of
this field is done with the assignment operator instead of using the
addition assignment operator.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

[danbev]

CI: https://ci.nodejs.org/job/node-test-pull-request/13581/

[danbev]

node-test-commit failure looks unrelated

console output:

not ok 876 parallel/test-http2-info-headers-errors
  ---
  duration_ms: 0.342
  severity: fail
  stack: |-
    (node:605) ExperimentalWarning: The http2 module is an experimental API.
  ...

[addaleax]

LGTM

The way this was previously done was not because setting to 0 was necessary, but because it made the statements in that list consistent, so changing it should not be an issue

[apapirovski]

If we're doing this — which I'm not a fan of because the chained statement is now much harder to read (the first and second operations are different) — then we should be doing this for disable() too.

The subsystem should be updated to async_hooks rather than src.

[danbev]

@apapirovski I've updated the disable function now and updated the subsystem. Thanks for that.

I know that @addaleax approved this change but I'm getting the feeling that I might be alone in my view regarding that this change is for the better. How about if anyone else chimes in favour of keeping it as it is lets close this.

Outdated

[apapirovski]

@danbev Thanks for making the changes. I'm fine with it landing. It's totally possible I'm alone in finding it a bit harder to read :)

[danbev]

Landed in ddcc00b.