It doesn't make any sense to have project inherit bits
for regular files, even though this won't cause any
problem, but it is better fix this.

Cc: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: NWang Shilong <wshilong@ddn.com>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>