appletalk: Remove the now superfluous sentinel elements from ctl_table array

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which will
reduce the overall build time size of the kernel and run time memory
bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/[e-mail]/)

Remove sentinel from atalk_table ctl_table array.

Acked-by: Kees Cook <[e-mail]> # loadpin & yama
Signed-off-by: Joel Granados <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/appletalk/sysctl_net_atalk.c

···
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
-	{ },
 };
 
 static struct ctl_table_header *atalk_table_header;