[PATCH bpf 1/2] libbpf: Fix return zero when elf_begin failed

[Pu Lehui <pulehui@xxxxxxxxxxxxxxx>]

From: Pu Lehui <pulehui@xxxxxxxxxx>

The error number of elf_begin is omitted when encapsulating the
btf_find_elf_sections function.

Fixes: c86f180ffc99 ("libbpf: Make btf_parse_elf process .BTF.base transparently")
Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
---
 tools/lib/bpf/btf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 12468ae0d573..7e810fa468ea 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1186,6 +1186,7 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
 
 	elf = elf_begin(fd, ELF_C_READ, NULL);
 	if (!elf) {
+		err = -LIBBPF_ERRNO__FORMAT;
 		pr_warn("failed to open %s as ELF file\n", path);
 		goto done;
 	}
-- 
2.34.1