services: Make release_process() static.

[Sebastian Lackner]

On 22.03.2016 11:26, Francois Gouget wrote:
> Signed-off-by: Francois Gouget <fgouget at free.fr>
> ---
>  programs/services/services.c | 12 ++++++------
>  programs/services/services.h |  1 -
>  2 files changed, 6 insertions(+), 7 deletions(-)
> 

I do not mind if this patch is accepted, but follow patches would have to undo this change again.
We also need the function from other services files.