[PATCH] libpf: Fix for the compiler sanity checking

When compiling libbpf with sanitation, ubsan will report the following:
```
left shift of 1 by 31 places cannot be represented in type 'int'
```
let's fix it by casting int to u32 before shifting.

Signed-off-by: Tan Wei <[email protected]>
---
 tools/lib/bpf/libbpf_internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 4c46d34fc..222d2f1c0 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -259,7 +259,7 @@ static inline enum btf_func_linkage btf_func_linkage(const struct btf_type *t)
 
 static inline __u32 btf_type_info(int kind, int vlen, int kflag)
 {
-	return (kflag << 31) | (kind << 24) | vlen;
+	return ((__u32)kflag << 31) | (kind << 24) | vlen;
 }
 
 enum map_def_parts {
-- 
2.54.0