jfs: remove unused declarations for jfs

extRealloc(), xtRelocate(), xtDelete() and extFill() have been
removed since commit e471e594 ("fs/jfs: Remove dead code"),
so remove them.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

fs/jfs/jfs_extent.h

@@ -10,9 +10,7 @@
 	(addressPXD(&(JFS_IP(ip)->ixpxd)) + lengthPXD(&(JFS_IP(ip)->ixpxd)) - 1)
 
 extern int	extAlloc(struct inode *, s64, s64, xad_t *, bool);
-extern int	extFill(struct inode *, xad_t *);
 extern int	extHint(struct inode *, s64, xad_t *);
-extern int	extRealloc(struct inode *, s64, xad_t *, bool);
 extern int	extRecord(struct inode *, xad_t *);
 
 #endif	/* _H_JFS_EXTENT */

fs/jfs/jfs_xtree.h

@@ -96,12 +96,8 @@ extern int xtInsert(tid_t tid, struct inode *ip,
 extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
 		    int flag);
 extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
-extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
-		    int flag);
 extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
 extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
-extern int xtRelocate(tid_t tid, struct inode *ip,
-		      xad_t * oxad, s64 nxaddr, int xtype);
 extern int xtAppend(tid_t tid,
 		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
 		    int *xlenp, s64 * xaddrp, int flag);