Revert from using __kernel_fsid_t to fsid_t since ia64 now defines

this correctly

fs/xfs/linux/xfs_vfs.h

@@ -44,8 +44,8 @@ struct xfs_mount_args;
 
 typedef struct vfs {
 	u_int			vfs_flag;	/* flags */
-	__kernel_fsid_t			vfs_fsid;	/* file system ID */
-	__kernel_fsid_t			*vfs_altfsid;	/* An ID fixed for life of FS */
+	fsid_t			vfs_fsid;	/* file system ID */
+	fsid_t			*vfs_altfsid;	/* An ID fixed for life of FS */
 	bhv_head_t		vfs_bh;		/* head of vfs behavior chain */
 	struct super_block	*vfs_super;	/* Linux superblock structure */
 	struct task_struct	*vfs_sync_task;

fs/xfs/xfs_mount.c

@@ -903,7 +903,7 @@ xfs_mountfs(
 	 *  File systems that don't support user level file handles (i.e.
 	 *  all of them except for XFS) will leave vfs_altfsid as NULL.
 	 */
-	vfsp->vfs_altfsid = (__kernel_fsid_t *)mp->m_fixedfsid;
+	vfsp->vfs_altfsid = (fsid_t *)mp->m_fixedfsid;
 	mp->m_dmevmask = 0;	/* not persistent; set after each mount */
 
 	/*