Fix: correctly convert ptr arg for destroy func

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/hpy/GraalHPyJNIContext.java

@@ -211,7 +211,7 @@ static Object doCached(GraalHPyJNIFunctionPointer receiver, Object[] arguments,
                                         (long) arguments[3], convertArgNode.execute(arguments, 4));
                         break;
                     case DESTROYFUNC:
-                        GraalHPyContext.hpyCallDestroyFunc((long) arguments[0], receiver.pointer);
+                        GraalHPyContext.hpyCallDestroyFunc(convertArgNode.execute(arguments, 0), receiver.pointer);
                         result = 0;
                         break;
                     case FREEFUNC: