filesystems: add set_nlink()

Replace remaining direct i_nlink updates with a new set_nlink()
updater function.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 346e328..2f213d1 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -90,7 +90,7 @@
 			vnode->vfs_inode.i_uid = status->owner;
 			vnode->vfs_inode.i_gid = status->group;
 			vnode->vfs_inode.i_generation = vnode->fid.unique;
-			vnode->vfs_inode.i_nlink = status->nlink;
+			set_nlink(&vnode->vfs_inode, status->nlink);
 
 			mode = vnode->vfs_inode.i_mode;
 			mode &= ~S_IALLUGO;