8156820: Nashorn nightly test failure after fix for 8156738

Reviewed-by: hannesw, mhaupt

nashorn/test/src/jdk/dynalink/test/LinkedCallSiteLocationTest.java

@@ -71,7 +71,7 @@ public class LinkedCallSiteLocationTest {
     }
 
     private static int getLineNumber() {
-        return StackWalker.getInstance().walk(s -> s.skip(1).findFirst().get().getLineNumber().getAsInt());
+        return StackWalker.getInstance().walk(s -> s.skip(1).findFirst().get().getLineNumber());
     }
 
     public static class TestClass1 {