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netfilter: Factor out the hook list selection from nf_register_hook
- Add a new function find_nf_hook_list to select the nf_hook_list
- Fail nf_register_hook when asked for a per netdevice hook list when
support for per netdevice hook lists is not built into the kernel.
- Move the hook list head selection outside of nf_hook_mutex as
nothing in the selection requires the hook list, and error handling
is simpler if a mutex is not held.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>