tools/runqslower: Update perf_buffer__new() calls

Use v1.0+ compatible variant of perf_buffer__new() call to prepare for
deprecation.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211111053624.190580-9-andrii@kernel.org

tools/bpf/runqslower/runqslower.c

@@ -123,7 +123,6 @@ int main(int argc, char **argv)
 		.parser = parse_arg,
 		.doc = argp_program_doc,
 	};
-	struct perf_buffer_opts pb_opts;
 	struct perf_buffer *pb = NULL;
 	struct runqslower_bpf *obj;
 	int err;
@@ -165,9 +164,8 @@ int main(int argc, char **argv)
 	printf("Tracing run queue latency higher than %llu us\n", env.min_us);
 	printf("%-8s %-16s %-6s %14s\n", "TIME", "COMM", "PID", "LAT(us)");
 
-	pb_opts.sample_cb = handle_event;
-	pb_opts.lost_cb = handle_lost_events;
-	pb = perf_buffer__new(bpf_map__fd(obj->maps.events), 64, &pb_opts);
+	pb = perf_buffer__new(bpf_map__fd(obj->maps.events), 64,
+			      handle_event, handle_lost_events, NULL, NULL);
 	err = libbpf_get_error(pb);
 	if (err) {
 		pb = NULL;