Fix compilation warning on Windows
diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c
index ab2cd72..d370f9a 100644
--- a/Modules/_multiprocessing/multiprocessing.c
+++ b/Modules/_multiprocessing/multiprocessing.c
@@ -99,7 +99,7 @@
 PyMODINIT_FUNC
 PyInit__multiprocessing(void)
 {
-    PyObject *module, *temp, *value;
+    PyObject *module, *temp, *value = NULL;
 
     /* Initialize module */
     module = PyModule_Create(&multiprocessing_module);