When issuing an ioctl for a file that exists in a FAT32 file system,
the FAT ioctl() is first executed, but it returns -ENOSYS in
an attempt to pass through to the vfs.
Therefore, the ioctl of the VFS layer, which expects -ENOTTY,
is not processed and an error occurs.
Signed-off-by: Takeyoshi Kikuchi <kikuchi@centurysys.co.jp>
716a95934d