selftests/bpf: test_verifier verbose causes erroneous failures

When running test_verifier with the -v flag and a test with
`expected_ret==VERBOSE_ACCEPT`, the opts.log_level is unintentionally
overwritten because the verbose flag takes precedence. This leads to
a mismatch in the expected and actual contents of bpf_vlog, causing
tests to fail incorrectly.

Reorder the conditional logic that sets opts.log_level to preserve
the expected log level and prevent it from being overridden by -v.

Signed-off-by: Gregory Bell <[email protected]>
Link: https://lore.kernel.org/r/182bf00474f817c99f968a9edb119882f62be0f8.1747058195.git.grbell@redhat.com
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: Gbell26

tools/testing/selftests/bpf/test_verifier.c

@@ -1559,10 +1559,10 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 		       test->errstr_unpriv : test->errstr;
 
 	opts.expected_attach_type = test->expected_attach_type;
-	if (verbose)
-		opts.log_level = verif_log_level | 4; /* force stats */
-	else if (expected_ret == VERBOSE_ACCEPT)
+	if (expected_ret == VERBOSE_ACCEPT)
 		opts.log_level = 2;
+	else if (verbose)
+		opts.log_level = verif_log_level | 4; /* force stats */
 	else
 		opts.log_level = DEFAULT_LIBBPF_LOG_LEVEL;
 	opts.prog_flags = pflags;