lsm: remove the now superfluous sentinel element 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 the sentinel from all files under security/ that register a
sysctl table.

Signed-off-by: Joel Granados <[e-mail]>
Acked-by: Kees Cook <[e-mail]> # loadpin & yama
Tested-by: Valentin Schneider <[e-mail]>
Reviewed-by: Valentin Schneider <[e-mail]>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <[e-mail]>

security/apparmor/lsm.c

···
 		.mode           = 0600,
 		.proc_handler   = apparmor_dointvec,
 	},
-	{ }
 };
 
 static int __init apparmor_init_sysctl(void)

security/keys/sysctl.c

···
 		.extra2 = (void *) SYSCTL_INT_MAX,
 	},
 #endif
-	{ }
 };
 
 static int __init init_security_keys_sysctls(void)

security/loadpin/loadpin.c

···
 		.extra1         = SYSCTL_ONE,
 		.extra2         = SYSCTL_ONE,
 	},
-	{ }
 };
 
 static void set_sysctl(bool is_writable)

security/yama/yama_lsm.c

···
 		.extra1         = SYSCTL_ZERO,
 		.extra2         = &max_scope,
 	},
-	{ }
 };
 static void __init yama_init_sysctl(void)
 {