RFR: 8298526: Close the stopped jfr after JFR.dump

[xpbob]

start jfr with duration

jcmd 31514 JFR.start duration=30s
31514:
Started recording 1.

Use jcmd 31514 JFR.stop name=1 filename=FILEPATH to copy recording data to file.



use JFR.check after 30s

jcmd 31514 JFR.check
31514:
Recording 1: name=1 duration=30s (stopped)


Unable to close the stopped jfr

jcmd 31514 JFR.stop name=1 filename=/data/test.jfr
31514:
Destination can't be set on a recording that has been stopped/closed
``` 
 
Add a check after dump,close the stopped jfr

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Commit messages:
 - 8298526: Close the stopped jfr after JFR.dump

Changes: https://git.openjdk.org/jdk/pull/11625/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11625&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298526
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11625.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11625/head:pull/11625

PR: https://git.openjdk.org/jdk/pull/11625