fix(storage/fatfs): Compiler unused warning

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);
      |          ^~~~~

Author: safocl

components/fatfs/diskio/diskio_rawflash.c

@@ -91,9 +91,9 @@ DRESULT ff_raw_write (BYTE pdrv, const BYTE *buff, DWORD sector, UINT count)
 
 DRESULT ff_raw_ioctl (BYTE pdrv, BYTE cmd, void *buff)
 {
-    const esp_partition_t* part = s_ff_raw_handles[pdrv];
     ESP_LOGV(TAG, "ff_raw_ioctl: cmd=%in", cmd);
-    assert(part);
+    assert(s_ff_raw_handles[pdrv]);
+
     switch (cmd) {
         case CTRL_SYNC:
             return RES_OK;

components/fatfs/vfs/vfs_fat_sdmmc.c

@@ -500,8 +500,12 @@ esp_err_t esp_vfs_fat_sdcard_format_cfg(const char *base_path, sdmmc_card_t *car
 
     //format
     uint32_t id = FF_VOLUMES;
-    bool found = s_get_context_id_by_card(card, &id);
-    assert(found);
+
+    {
+        const bool found = s_get_context_id_by_card(card, &id);
+        (void)found;
+        assert(found);
+    }
 
     if (cfg) {
         s_ctx[id]->mount_config = *cfg;