ocfs2: clean up some dead code

clean up some unused functions and parameters.

Link: http://lkml.kernel.org/r/598A5E21.2080807@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Alex Chen <alex.chen@huawei.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/file.c

@@ -713,13 +713,6 @@ leave:
 	return status;
 }
 
-int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
-		u32 clusters_to_add, int mark_unwritten)
-{
-	return __ocfs2_extend_allocation(inode, logical_start,
-			clusters_to_add, mark_unwritten);
-}
-
 /*
  * While a write will already be ordering the data, a truncate will not.
  * Thus, we need to explicitly order the zeroed pages.