8287463: JFR: Disable TestDevNull.java on Windows

Reviewed-by: mgronlun

Author: egahlin

test/jdk/jdk/jfr/api/recording/dump/TestDumpDevNull.java

@@ -24,14 +24,13 @@
 package jdk.jfr.api.recording.dump;
 
 import java.nio.file.Path;
-
 import jdk.jfr.Recording;
 
 /**
  * @test
  * @summary Tests that it's possible to dump to /dev/null without a livelock
  * @key jfr
- * @requires vm.hasJFR
+ * @requires vm.hasJFR & (os.family != "windows")
  * @library /test/lib
  * @run main/othervm -Xlog:jfr jdk.jfr.api.recording.dump.TestDumpDevNull
  */