xfs: kill VN_DIRTY()

Only one user of the macro and the dirty mapping check is redundant
so just get rid of it.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/xfs_inode.c

@@ -1635,7 +1635,7 @@ xfs_release(
 		truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
 		if (truncated) {
 			xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
-			if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0) {
+			if (ip->i_delayed_blks > 0) {
 				error = filemap_flush(VFS_I(ip)->i_mapping);
 				if (error)
 					return error;

fs/xfs/xfs_vnode.h

@@ -39,8 +39,6 @@ struct attrlist_cursor_kern;
  */
 #define VN_MAPPED(vp)	mapping_mapped(vp->i_mapping)
 #define VN_CACHED(vp)	(vp->i_mapping->nrpages)
-#define VN_DIRTY(vp)	mapping_tagged(vp->i_mapping, \
-					PAGECACHE_TAG_DIRTY)
 
 
 #endif	/* __XFS_VNODE_H__ */