SF but #417587: compiler warnings compiling 2.1.
Repaired *some* of the SGI compiler warnings Sjoerd Mullender reported.
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index c1cc013..c48278f 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -818,7 +818,7 @@
 	m_obj->data = mmap(NULL, map_size, 
 			   prot, flags,
 			   fd, 0);
-	if (m_obj->data == (void *)-1)
+	if (m_obj->data == (char *)-1)
 	{
 		Py_DECREF(m_obj);
 		PyErr_SetFromErrno(mmap_module_error);