xfs: cleanup the definition of struct xfs_dir2_data_entry

Remove the tag member which is at a variable offset after the actual
name, and make name a real variable sized C99 array instead of the incorrect
one-sized array which confuses (not only) gcc.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/xfs_dir2_data.h

@@ -98,14 +98,15 @@ typedef struct xfs_dir2_data_hdr {
 
 /*
  * Active entry in a data block.  Aligned to 8 bytes.
- * Tag appears as the last 2 bytes.
+ *
+ * After the variable length name field there is a 2 byte tag field, which
+ * can be accessed using xfs_dir2_data_entry_tag_p.
  */
 typedef struct xfs_dir2_data_entry {
 	__be64			inumber;	/* inode number */
 	__u8			namelen;	/* name length */
-	__u8			name[1];	/* name bytes, no null */
-						/* variable offset */
-	__be16			tag;		/* starting offset of us */
+	__u8			name[];		/* name bytes, no null */
+     /*	__be16                  tag; */		/* starting offset of us */
 } xfs_dir2_data_entry_t;
 
 /*