netfilter: x_tables: kill check_entry helper

netfilter: x_tables: kill check_entry helper

commit aa412ba225dd3bc36d404c28cdc3d674850d80d0 upstream.

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: Willy Tarreau <w@1wt.eu>
[sw0312.kim: cherry-pick from linux-3.10.y to apply CVE]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I8133f6a0bec62a70097f6bc442967d9bd0569648