nfs: make nfs_async_rename non-static

...and move the prototype for nfs_sillyrename to internal.h.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Anna Schumaker <Anna.Schumaker@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 3e6798c..818ded7 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -399,7 +399,7 @@
  *
  * It's expected that valid references to the dentries and inodes are held
  */
-static struct rpc_task *
+struct rpc_task *
 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 		 struct dentry *old_dentry, struct dentry *new_dentry,
 		 void (*complete)(struct rpc_task *, struct nfs_renamedata *))