net sysctl: Add place holder functions for when sysctl support is compiled out of...

net sysctl: Add place holder functions for when sysctl support is compiled out of the kernel.

Randy Dunlap <[email protected]> reported:
> On 04/23/2012 12:07 AM, Stephen Rothwell wrote:
>
>> Hi all,
>>
>> Changes since 20120420:
>
>
>
> ERROR: "unregister_net_sysctl_table" [net/phonet/phonet.ko] undefined!
> ERROR: "register_net_sysctl" [net/phonet/phonet.ko] undefined!
>
> when CONFIG_SYSCTL is not enabled.

Add static inline stub functions to gracefully handle the case when sysctl
support is not present.

Signed-off-by: Eric W. Biederman <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Signed-off-by: David S. Miller <[email protected]>