fatfs: fix errors for GCC 8 support and some indentation
fatfs: fix errors for GCC 8 support and some indentation

components/fatfs/src/ff.c: In function 'f_fdisk':
components/fatfs/src/ff.c:5995:5: error: this 'for' clause does not guard... [-Werror=misleading-indentation]
     for (n = 16; n < 256 && sz_disk / n / cluster_size > 1024; n *= 2) ;
     ^~~
components/fatfs/src/ff.c:5996:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  if (n == 256) n--;
  ^~

mashaoze/esp-idf,www220/esp-idf,armada-ai/esp-idf,mashaoze/esp-idf,www220/esp-idf,mashaoze/esp-idf,espressif/esp-idf,www220/esp-idf,espressif/esp-idf,armada-ai/esp-idf,espressif/esp-idf,armada-ai/esp-idf,armada-ai/esp-idf,www220/esp-idf,espressif/esp-idf,www220/esp-idf,mashaoze/esp-idf,mashaoze/esp-idf