Fixes error code on test run

`TestMain` is used for all tests, not just benchmarks as it looks like
the file might expect. The error code was being ignored which results in
an `ok` status on each test run even when there are failures.

This commit fixes `TestMain` to return the error code returned from
`Run()`. I did not look at anything else going on in the file.

Author: ornj

parse_bench_test.go

@@ -92,12 +92,12 @@ func benchmarkParseLargeConfig(b *testing.B, sz int) {
 	}
 }
 
-func TestMain(b *testing.M) {
-	b.Run()
+func TestMain(m *testing.M) {
+	code := m.Run()
 	if rm != nil {
 		rm()
 	}
-	os.Exit(0)
+	os.Exit(code)
 }
 
 func BenchmarkParseLargeConfig_Slow_TokBuf_0(b *testing.B)   { benchmarkParseLargeConfig(b, 0) }