replace PyXXX_Length calls with PyXXX_Size calls
diff --git a/Modules/stropmodule.c b/Modules/stropmodule.c
index 35674de..612d0d3 100644
--- a/Modules/stropmodule.c
+++ b/Modules/stropmodule.c
@@ -190,7 +190,7 @@
 		seplen = 1;
 	}
 
-	seqlen = PySequence_Length(seq);
+	seqlen = PySequence_Size(seq);
 	if (seqlen < 0 && PyErr_Occurred())
 		return NULL;