closes bpo-38803: Fix leak in posixmodule. (GH-17373)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index f738630..8985471 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -7589,6 +7589,7 @@
 
     /* XXX(nnorwitz): Copied (w/mods) from resource.c, there should be only one. */
     result = PyStructSequence_New((PyTypeObject*) struct_rusage);
+    Py_DECREF(struct_rusage);
     if (!result)
         return NULL;