Fix a build error on 32-bit system:

  util/bpf_lock_contention.c: In function 'lock_contention_get_name':
  util/bpf_lock_contention.c:253:50: error: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'u64 {aka long long unsigned int}' [-Werror=format=]
     snprintf(name_buf, sizeof(name_buf), "cgroup:%lu", cgrp_id);
                                                  ~~^
                                                  %llu
  cc1: all warnings being treated as errors

Fixes: d0c502e46e97 ("perf lock contention: Prepare to handle cgroups")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
 tools/perf/util/bpf_lock_contention.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/bpf_lock_contention.c b/tools/perf/util/bpf_lock_contention.c
index e105245eb905..f1716c089c99 100644
--- a/tools/perf/util/bpf_lock_contention.c
+++ b/tools/perf/util/bpf_lock_contention.c
@@ -12,6 +12,7 @@
 #include <linux/zalloc.h>
 #include <linux/string.h>
 #include <bpf/bpf.h>
+#include <inttypes.h>
 
 #include "bpf_skel/lock_contention.skel.h"
 #include "bpf_skel/lock_data.h"
@@ -250,7 +251,7 @@ static const char *lock_contention_get_name(struct lock_contention *con,
 		if (cgrp)
 			return cgrp->name;
 
-		snprintf(name_buf, sizeof(name_buf), "cgroup:%lu", cgrp_id);
+		snprintf(name_buf, sizeof(name_buf), "cgroup:%" PRIu64 "", cgrp_id);
 		return name_buf;
 	}
 
-- 
2.34.1