netfilter: x_tables: kill check_entry helper

netfilter: x_tables: kill check_entry helper

Orabug: 24690280
CVE: CVE-2016-3134

[ Upstream commit aa412ba225dd3bc36d404c28cdc3d674850d80d0 ]

Once we add more sanity testing to xt_check_entry_offsets it
becomes relvant if we're expecting a 32bit 'config_compat' blob
or a normal one.

Since we already have a lot of similar-named functions (check_entry,
compat_check_entry, find_and_check_entry, etc.) and the current
incarnation is short just fold its contents into the callers.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 801cd32774d12dccfcfc0c22b0b26d84ed995c6f)
Signed-off-by: Brian Maly <brian.maly@oracle.com>