xfs: rename XFS_IGET_BULKSTAT to XFS_IGET_UNTRUSTED

xfs: rename XFS_IGET_BULKSTAT to XFS_IGET_UNTRUSTED

commit 1920779e67cbf5ea8afef317777c5bf2b8096188 upstream.

Inode numbers may come from somewhere external to the filesystem
(e.g. file handles, bulkstat information) and so are inherently
untrusted. Rename the flag we use for these lookups to make it
obvious we are doing a lookup of an untrusted inode number and need
to verify it completely before trying to read it from disk.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>