fs/ntfs3: Additional check in ni_clear()

Checking of NTFS_FLAGS_LOG_REPLAYING added to prevent access to
uninitialized bitmap during replay process.

Reported-by:  <syzbot+3bfd2cc059ab93efcdb4@syzkaller.appspotmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>