libbpf: Propagate errors when retrieving enum value for typed data display

When retrieving the enum value associated with typed data during
"is data zero?" checking in btf_dump_type_data_check_zero(), the
return value of btf_dump_get_enum_value() is not passed to the caller
if the function returns a non-zero (error) value.  Currently, 0
is returned if the function returns an error.  We should instead
propagate the error to the caller.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1626770993-11073-4-git-send-email-alan.maguire@oracle.com

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index d52e546..e4b483f 100644 (file)
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -2166,8 +2166,9 @@ static int btf_dump_type_data_check_zero(struct btf_dump *d,
                return -ENODATA;
        }
        case BTF_KIND_ENUM:
-               if (btf_dump_get_enum_value(d, t, data, id, &value))
-                       return 0;
+               err = btf_dump_get_enum_value(d, t, data, id, &value);
+               if (err)
+                       return err;
                if (value == 0)
                        return -ENODATA;
                return 0;