[Patch] document sk == NULL case for rtnl_link_alloc_cache()

[Thomas Haller]

On Thu, 2014-03-20 at 10:45 -0700, Cong Wang wrote:
> When sk == NULL, rtnl_link_alloc_cache() returns 0 but the cache
> is still empty. We should document this behavior, otherwise it is confusing.


Hi Cong,


pushed to master as
https://github.com/thom311/libnl/commit/67a704676c9ccc153f87aa86cd0a444f42608162


Note that I added the prefix "link: " to your commit message.

I also modified your patch to fix a error that already existed before your patch:

- If the operation succeeds the resulting cache will a link object...
+ If the operation succeeds, the resulting cache will contain a link object...


Thanks,
Thomas
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