Move check in ntfs_file_aio_write_nolock() to ntfs_file_aio_write() and
use new freeze protection.
CC: linux-ntfs-dev@lists.sourceforge.net CC: Anton Altaparmakov <anton@tuxera.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>