net: Trap attempts to call sock_kfree_s() with a NULL pointer.
Unlike normal kfree() it is never right to call sock_kfree_s() with
a NULL pointer, because sock_kfree_s() also has the side effect of
discharging the memory from the sockets quota.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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