What does this implement/fix?

ESPHome Version: e.g. 2026.2.0b3

openthread module raises gcc format warning (or error if enforced via -Werror) if configured as MTD with DEBUG logging.

--> Try to compile provided yaml below

In file included from src/esphome/core/component.h:9,
                 from src/esphome/core/automation.h:3,
                 from src/esphome/components/mdns/mdns_component.h:5,
                 from src/esphome/components/openthread/openthread.h:5,
                 from src/esphome/components/openthread/openthread_esp.cpp:4:
src/esphome/components/openthread/openthread_esp.cpp: In member function 'void esphome::openthread::OpenThreadComponent::ot_main()':
src/esphome/components/openthread/openthread_esp.cpp:118:19: error: format '%d' expects argument of type 'int', but argument 5 has type 'uint32_t' {aka 'long unsigned int'} [-Werror=format=]
  118 |     ESP_LOGD(TAG, "Link Polling Period: %d", link_polling_period);
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~

End user impact: Likely none on wrong arg interpretation, in worst case bad output. Here only signed vs unsigned.

Developer impact: Slightly annoying if to compile tree with strict warnings for enforcing QA.

Format fix is obvious.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Developer breaking change (an API change that could break external components)
• Code quality improvements to existing code or addition of tests
• Other

Related issue or feature (if applicable):

• fixes N/A

Pull request in esphome-docs with documentation (if applicable):

• esphome/esphome-docs#

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx
• LN882x
• nRF52840

Example entry for config.yaml:

esphome:
  name: compileerror
  platformio_options:
    build_flags:
      - -Wall -Werror

esp32:
  variant: esp32c6

network:
  enable_ipv6: true

openthread:
  device_type: MTD
  tlv: ""  # Required, but irrelevant

logger:
  level: DEBUG

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.