On Tue, 29 Jun 2021 18:51:15 +0300
Alexander Mikhalitsyn [off-list ref] wrote:

+	const struct rtnl_dump_filter_arg a[2] = {
+		{ .filter = filter, .arg1 = arg1,
+		  .errhndlr = errhndlr, .arg2 = arg2, .nc_flags = nc_flags, },
+		{ .filter = NULL,   .arg1 = NULL,
+		  .errhndlr = NULL, .arg2 = NULL, .nc_flags = 0, },
 	};

I am OK with this as is. But you don't need to add initializers for fields
that are 0/NULL (at least in C).

So could be:
	const struct rtnl_dump_filter_arg a[] = {
		{ .filter = filter, .arg1 = arg1,
		  .errhndlr = errhndlr, .arg2 = arg2, .nc_flags = nc_flags, },
		{  },
 	};