Remove unneeded variable assignment.

Found using Clang's static analyzer.
diff --git a/Modules/_bisectmodule.c b/Modules/_bisectmodule.c
index fc54954..b78476d 100644
--- a/Modules/_bisectmodule.c
+++ b/Modules/_bisectmodule.c
@@ -237,7 +237,5 @@
 PyMODINIT_FUNC
 init_bisect(void)
 {
-	PyObject *m;
-
-	m = Py_InitModule3("_bisect", bisect_methods, module_doc);
+	Py_InitModule3("_bisect", bisect_methods, module_doc);
 }