sunrpc: simplify two-level sysctl registration for svcrdma_parm_table

There is no need to declare two tables to just create directories,
this can be easily be done with a prefix path with register_sysctl().

Simplify this registration.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/xprtrdma/svc_rdma.c

@@ -212,24 +212,6 @@ static struct ctl_table svcrdma_parm_table[] = {
 	{ },
 };
 
-static struct ctl_table svcrdma_table[] = {
-	{
-		.procname	= "svc_rdma",
-		.mode		= 0555,
-		.child		= svcrdma_parm_table
-	},
-	{ },
-};
-
-static struct ctl_table svcrdma_root_table[] = {
-	{
-		.procname	= "sunrpc",
-		.mode		= 0555,
-		.child		= svcrdma_table
-	},
-	{ },
-};
-
 static void svc_rdma_proc_cleanup(void)
 {
 	if (!svcrdma_table_header)
@@ -263,7 +245,8 @@ static int svc_rdma_proc_init(void)
 	if (rc)
 		goto out_err;
 
-	svcrdma_table_header = register_sysctl_table(svcrdma_root_table);
+	svcrdma_table_header = register_sysctl("sunrpc/svc_rdma",
+					       svcrdma_parm_table);
 	return 0;
 
 out_err: