fix(vfs): fix stat initialization, close espressif#11908 (espressif#11911)

* fix(vfs): fix stat initialisation, close espressif#11908 * fix(vfs): change log level from warning to error for stat failure

Author: JakubAndrysek

libraries/FS/src/vfs_api.cpp

@@ -276,8 +276,12 @@ VFSFileImpl::VFSFileImpl(VFSImpl *fs, const char *fpath, const char *mode) : _fs
  if (!_f) {
  log_e("fopen(%s) failed", temp);
  }
- if (_f && (_stat.st_blksize == 0)) {
- setvbuf(_f, NULL, _IOFBF, DEFAULT_FILE_BUFFER_SIZE);
+ if (!stat(temp, &_stat)) {
+ if (_f && (_stat.st_blksize == 0)) {
+ setvbuf(_f, NULL, _IOFBF, DEFAULT_FILE_BUFFER_SIZE);
+ }
+ } else {
+ log_e("stat(%s) failed", temp);
  }
  }
  free(temp);