Fix system layer call: add missing brackets

[andy31415]

Fix master CI build: merge and revert caused a transition from ::SystemLayer to ::SystemLayer() to be missed.

Tested: local build passes after the change.

[mlepage-google]

I got this error too, needs this fix.

[mlepage-google]

Weird I don't think I can approve? (I don't see the button.)

[mlepage-google]

Ah I see it's already merged, I just got unlucky with syncing after the break but before the fix.

[github-actions]

Size increase report for "esp32-example-build" from 0ca8cbd

File	Section	File	VM
chip-ipv6only-app.elf	.flash.text	172	172
chip-lock-app.elf	.flash.text	-60	-60

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-bridge-app.elf and ./pull_artifact/chip-bridge-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-ipv6only-app.elf and ./pull_artifact/chip-ipv6only-app.elf:

sections,vmsize,filesize
[Unmapped],0,3924
.flash.text,172,172

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize
[Unmapped],0,60
.xt.prop._ZNK4chip4SpanIhE7SubSpanEjj,0,12
.xt.lit._ZNK4chip4SpanIhE7SubSpanEjj,0,8
.debug_loc,0,-4
.flash.text,-60,-60

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize