Merge branch 'net-kzfree'

zhong jiang says:

====================
net: Use kzfree() directly

With the help of Coccinelle. We find some place to replace.

@@
expression M, S;
@@

- memset(M, 0, S);
- kfree(M);
+ kzfree(M);
====================

Signed-off-by: David S. Miller <davem@davemloft.net>