[PATCH perf] perf: Fix btf_vlen() signedness errors

[Alan Maguire]

Commit f7a6b9eaff3e6 ("bpf: Extend BTF UAPI vlen, kinds to use unused bits")

extended the return value for btf_vlen() to __u32, triggering
errors for cases where an int was used to store return value.
Fix these cases for perf as was done for other libbpf consumers.

Reported-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
 tools/perf/builtin-trace.c | 6 +++---
 tools/perf/util/btf.c      | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 48615ddccd93..9903d79c4b77 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -964,7 +964,7 @@ static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_
 	struct btf *btf = arg->trace->btf;
 	struct btf_enum *be = btf_enum(bt);
 
-	for (int i = 0; i < btf_vlen(bt); ++i, ++be) {
+	for (unsigned int i = 0; i < btf_vlen(bt); ++i, ++be) {
 		const char *name = btf__name_by_offset(btf, be->name_off);
 		int max_len = max(size, strlen(name));
 
@@ -1009,9 +1009,9 @@ static bool syscall_arg__strtoul_btf_type(char *bf, size_t size, struct syscall_
 static size_t btf_enum_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, int val)
 {
 	struct btf_enum *be = btf_enum(type);
-	const int nr_entries = btf_vlen(type);
+	const unsigned int nr_entries = btf_vlen(type);
 
-	for (int i = 0; i < nr_entries; ++i, ++be) {
+	for (unsigned int i = 0; i < nr_entries; ++i, ++be) {
 		if (be->val == val) {
 			return scnprintf(bf, size, "%s",
 					 btf__name_by_offset(btf, be->name_off));
diff --git a/tools/perf/util/btf.c b/tools/perf/util/btf.c
index bb163fe87767..1716b49d3568 100644
--- a/tools/perf/util/btf.c
+++ b/tools/perf/util/btf.c
@@ -14,7 +14,7 @@ const struct btf_member *__btf_type__find_member_by_name(struct btf *btf,
 {
 	const struct btf_type *t = btf__type_by_id(btf, type_id);
 	const struct btf_member *m;
-	int i;
+	unsigned int i;
 
 	for (i = 0, m = btf_members(t); i < btf_vlen(t); i++, m++) {
 		const char *current_member_name = btf__name_by_offset(btf, m->name_off);
-- 
2.47.3