fs/ntfs3: Remove impossible fault condition in fill_super

Remove root drop when we fault out. This can never happened because
when we allocate root we eather fault when no root or success.

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>