8251325: Miss 'L' for long value in if statement

[齋藤悠太]

Hi,
I want to correct typo.
JBS : https://bugs.openjdk.java.net/browse/JDK-8251325 <https://bugs.openjdk.java.net/browse/JDK-8251325>

This will be my first contribution. 
In other logic has' L 'at the end of all three, so I think it's a simple typo. (DCmdStart.java: 128) 

If there is no problem with the revision, I would like someone to sponsor me.
I will sign the OCA tomorrow.

The modifications are as follows.

```
$ hg diff -g
diff --git a/src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java b/src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java
--- a/src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java
@@ -132,7 +132,7 @@
         }
 
         if (delay != null) {
-            if (delay < 1000L * 1000L * 1000) {
+            if (delay < 1000L * 1000L * 1000L) {
                 // to avoid typo, delay shorter than 1s makes no sense.
                 throw new DCmdException("Could not start recording, delay must be at least 1 second.");
             }
```

Thanks to Chihiro Ito for reporting this.

Thanks.

Yuta Saito