fix(components): Compiler reports some warnings (IDFGH-14275)

[safocl]

Description

Some variables inserted to asserts, but it produce the warning reports with CONFIG_COMPILER_ASSERT_NDEBUG_EVALUATE=n :

esp-idf/components/driver/twai/twai.c warning: unused variable 'res' [-Wunused-variable]
  XXX |     bool res = twai_hal_init(&p_twai_obj->hal, &hal_config);
      |          ^~~
esp-idf/components/fatfs/diskio/diskio_rawflash.c warning: unused variable 'part' [-Wunused-variable]
   XX |     const esp_partition_t* part = s_ff_raw_handles[pdrv];
      |                            ^~~~
esp-idf/components/fatfs/vfs/vfs_fat_sdmmc.c warning: unused variable 'found' [-Wunused-variable]
  XXX |     bool found = s_get_context_id_by_card(card, &id);
      |          ^~~~~

This PR fix it (remove temporary unused variables).

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[CLAassistant]

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[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "fix(components): Compiler reports some warnings": body's lines must not be longer than 100 characters body must have leading blank line Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello safocl, we appreciate your contribution to this project!

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