[GFS2] Shrink gfs2_inode (7) - di_payload_format

This is almost never used. Its there for backward
compatibility with GFS1. It doesn't need its own
field since it can always be calculated from the
inode mode & flags. This saves a bit more space
in the gfs2_inode.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

include/linux/gfs2_ondisk.h

@@ -333,7 +333,6 @@ struct gfs2_dinode_host {
 	__u64 di_generation;	/* generation number for NFS */
 
 	__u32 di_flags;	/* GFS2_DIF_... */
-	__u32 di_payload_format;  /* GFS2_FORMAT_... */
 	__u16 di_height;	/* height of metadata */
 
 	/* These only apply to directories  */