SF bug #493561: incorrect format string descrobject.c (Neal Norwitz)

%300s should be %.300s, twice.
diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index 54c0347..e7aa4ec 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -108,7 +108,7 @@
 	if (descr->d_getset->get != NULL)
 		return descr->d_getset->get(obj, descr->d_getset->closure);
 	PyErr_Format(PyExc_TypeError,
-		     "attribute '%300s' of '%.100s' objects is not readable",
+		     "attribute '%.300s' of '%.100s' objects is not readable",
 		     descr_name((PyDescrObject *)descr),
 		     descr->d_type->tp_name);
 	return NULL;
@@ -163,7 +163,7 @@
 		return descr->d_getset->set(obj, value,
 					    descr->d_getset->closure);
 	PyErr_Format(PyExc_TypeError,
-		     "attribute '%300s' of '%.100s' objects is not writable",
+		     "attribute '%.300s' of '%.100s' objects is not writable",
 		     descr_name((PyDescrObject *)descr),
 		     descr->d_type->tp_name);
 	return -1;