Revert "net: kernel socket should be released in init_net namespace"

Revert "net: kernel socket should be released in init_net namespace"

This reverts commit c35d8a99f148f5699cf7f3eb6301f1bfd0370188.

That patch is solving a non-existant problem while creating a
real problem.  Just because a socket is allocated in the init
name space doesn't mean that it gets hashed in the init name space.

When we unhash it the name space must be the same as the one
we had when we hashed it.  So this patch is completely bogus
and causes socket leaks.

Reported-by: Andrey Wagin <avagin@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>