Merge branch 'remove-clear_sk'

Eric Dumazet says:

====================
net: remove clear_sk() method

Since IPv6 socket lookups no longer dereference pinet6 pointer
and UDP lost SLAB_DESTROY_BY_RCU special rules, we no longer
need special clear_sk() methods.
====================

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