ffserver_config: reflow _parse_ffconfig()

Signed-off-by: Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>
ffserver_config: reflow _get_arg()

Signed-off-by: Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>
ffserver_config: fix line width on fwd declarations

Signed-off-by: Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>