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/fuse/control.c b/fs/fuse/control.c
index 85542a7..42593c5 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -231,7 +231,7 @@
 	if (iop)
 		inode->i_op = iop;
 	inode->i_fop = fop;
-	inode->i_nlink = nlink;
+	set_nlink(inode, nlink);
 	inode->i_private = fc;
 	d_add(dentry, inode);
 	return dentry;