Revert "bpf: Defer the free of inner map when necessary"

This reverts commit 37d98fb9 which is
commit 87667336 upstream.

It breaks the Android kernel build and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I3540bf48363a60e704c1ed85871a2126fd365261
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>