net: rds: 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 element from ctl_table structs.

Signed-off-by: Joel Granados <[e-mail]>
Acked-by: Allison Henderson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/rds/ib_sysctl.c

···
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{ }
 };
 
 void rds_ib_sysctl_exit(void)

net/rds/sysctl.c

···
 		.mode           = 0644,
 		.proc_handler   = proc_dointvec,
 	},
-	{ }
 };
 
 void rds_sysctl_exit(void)

net/rds/tcp.c

···
 		.proc_handler   = rds_tcp_skbuf_handler,
 		.extra1		= &rds_tcp_min_rcvbuf,
 	},
-	{ }
 };
 
 u32 rds_tcp_write_seq(struct rds_tcp_connection *tc)