filesystems: add missing nlink wrappers

Replace direct i_nlink updates with the respective updater function
(inc_nlink, drop_nlink, clear_nlink, inode_dec_link_count).

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 7ae0d0d..baa82f8 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -359,7 +359,7 @@
 	} else if (mode & S_IFDIR) {
 		inode->i_op = &simple_dir_inode_operations;
 		inode->i_fop = &simple_dir_operations;
-		parent->d_inode->i_nlink++;
+		inc_nlink(parent->d_inode);
 	} else
 		BUG();
 	inode->i_private = data;