xfs: test quota's project ID on special files

xfs: test quota's project ID on special files

With addition of file_getattr() and file_setattr(), xfs_quota now can
set project ID on filesystem inodes behind special files. Previously,
quota reporting didn't count inodes of special files created before
project initialization. Only new inodes had project ID set.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>