Revert "bpf, sockmap: Fix sk->sk_forward_alloc warn_on in sk_stream_kill_queues"

This reverts commit e9915581 which is
commit d8616ee2 upstream.

It breaks the in-kernel API, and is not needed for the true bugfix to be
backported properly (this was a dependent patch to make upstream changes
easier), so it can be reverted.

If it is deemed that this change is needed in the Android branch, it can
be added back later in an ABI-safe way.

Bug: 161946584
Fixes: e9915581 ("bpf, sockmap: Fix sk->sk_forward_alloc warn_on in sk_stream_kill_queues")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5db9531762c48519b4d4c98a0316e1fe467a8640