[PATCH bpf-next 1/4] selftests/bpf: Print unexpected output on fail

[Joe Stringer]

This makes it easier to debug off-hand when the error message isn't
exactly as expected.

Signed-off-by: Joe Stringer <j...@wand.net.nz>
---
 tools/testing/selftests/bpf/test_verifier.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c 
b/tools/testing/selftests/bpf/test_verifier.c
index c0f16e93f9bd..6cf9bd6f08b7 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -11291,7 +11291,8 @@ static void do_test_single(struct bpf_test *test, bool 
unpriv,
                        goto fail_log;
                }
                if (!strstr(bpf_vlog, expected_err) && !reject_from_alignment) {
-                       printf("FAIL\nUnexpected error message!\n");
+                       printf("FAIL\nUnexpected error message!\n\tEXP: 
%s\n\tRES: %s\n",
+                             expected_err, bpf_vlog);
                        goto fail_log;
                }
        }
-- 
2.14.1