6896810: TEST_BUG: java/lang/ref/SoftReference/Pin.java fails with OOME during System.out.println

Reviewed-by: stefank, dholmes, chegar, sjohanss

jdk/test/java/lang/ref/SoftReference/Pin.java

@@ -76,6 +76,7 @@ public class Pin {
                 Thread.sleep(100);              // yield, for what it's worth
             }
         } catch (OutOfMemoryError e) {
+            chain = null; // Free memory for further work.
             System.err.println("Got OutOfMemoryError, as expected.");
         }