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/ncpfs/inode.c b/fs/ncpfs/inode.c
index 202f370..5b5fa33 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -228,7 +228,7 @@
 
 	DDPRINTK("ncp_read_inode: inode->i_mode = %u\n", inode->i_mode);
 
-	inode->i_nlink = 1;
+	set_nlink(inode, 1);
 	inode->i_uid = server->m.uid;
 	inode->i_gid = server->m.gid;