fs: rename "rename2" i_op to "rename"

Generated patch:

sed -i "s/\.rename2\t/\.rename\t\t/" `git grep -wl rename2`
sed -i "s/\brename2\b/rename/g" `git grep -wl rename2`

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/kernfs/dir.c

@@ -1137,7 +1137,7 @@ const struct inode_operations kernfs_dir_iops = {
 
 	.mkdir		= kernfs_iop_mkdir,
 	.rmdir		= kernfs_iop_rmdir,
-	.rename2	= kernfs_iop_rename,
+	.rename		= kernfs_iop_rename,
 };
 
 static struct kernfs_node *kernfs_leftmost_descendant(struct kernfs_node *pos)