fs/ntfs3: Refactoring of various minor issues

commit 6827d50b upstream.

Removed unused macro.
Changed null pointer checking.
Fixed inconsistent indenting.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: Rudi Heitbaum <rudi@heitbaum.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>