Remove unused variable, and fix a compilation warning on Windows.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 8ea2b97..33754d2 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -4062,7 +4062,7 @@
 static PyObject *
 win32_kill(PyObject *self, PyObject *args)
 {
-    PyObject *result, handle_obj;
+    PyObject *result;
     DWORD pid, sig, err;
     HANDLE handle;