[ccan] [PATCH 1/3] container_of: Add container_of_or_null()

[Rusty Russell]

David Gibson <david at gibson.dropbear.id.au> writes:
> It's quite common to have a pointer which could be either a pointer to a
> structure member, or NULL.  This needs special casing with container_of(),
> or it will convert NULL into something strange.
>
> This patch adds container_of_or_null(), which will return NULL if passed
> (an appropriately typed) NULL, or the containining structure as
> container_of() otherwise.
>
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied!

Thanks,
Rusty.