Retrieve bugfixing plomlib commit.

diff --git a/plomlib b/plomlib
index 0bf94804e718fb4d41995dbfe9c6dc3315d366f2..922a5599778859f950c78b516d8bdb478830ebe9 160000 (submodule)
--- a/plomlib
+++ b/plomlib
@@ -1 +1 @@
-Subproject commit 0bf94804e718fb4d41995dbfe9c6dc3315d366f2
+Subproject commit 922a5599778859f950c78b516d8bdb478830ebe9