Utilities/du: Use apparent size on devices that don't report blocks

Certain virtual filesystems (RAMFS) always report 0 used blocks, even
for files that are not empty. In this case, we should fall back to
reporting the apparent size, as showing zero is somewhat misleading.

Userland/Utilities/du.cpp

@@ -228,11 +228,12 @@ u64 print_space_usage(ByteString const& path, DuOption const& du_option, size_t
  return 0;
  }
 
- if (!du_option.apparent_size) {
+ // If the underlying FS reports 0 used blocks, apparent size may be more accurate
+ if (du_option.apparent_size || path_stat.st_blocks == 0) {
+ size += path_stat.st_size;
+ } else {
  constexpr auto block_size = 512;
  size += path_stat.st_blocks * block_size;
- } else {
- size += path_stat.st_size;
  }
 
  bool is_beyond_depth = current_depth > du_option.max_depth;