quota: Clean up the namespace in dqblk_xfs.h

Almost all identifiers use the FS_* namespace, so rename the missing few
XFS_* ones to FS_* as well.  Without this some people might get upset
about having too many XFS names in generic code.

Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index a5974c4..2857fd6 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2281,7 +2281,7 @@
 	memset(di, 0, sizeof(*di));
 	di->d_version = FS_DQUOT_VERSION;
 	di->d_flags = dquot->dq_type == USRQUOTA ?
-			XFS_USER_QUOTA : XFS_GROUP_QUOTA;
+			FS_USER_QUOTA : FS_GROUP_QUOTA;
 	di->d_id = dquot->dq_id;
 
 	spin_lock(&dq_data_lock);