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).

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[suda-morris]

If assert is disabled, the function called inside the assert will not be invoked. (it is an expected behavior of assert).

Then the twai driver missed an important initialization.