update osm2pgsql (hang on multipolygons)

diff --git a/osm2pgsql b/osm2pgsql
index cb7655a4ff7df7c93eb444e36035701b92b2ec35..b8af2b242f55b4f31abac9ba428d4ccf6aa51cd0 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit cb7655a4ff7df7c93eb444e36035701b92b2ec35
+Subproject commit b8af2b242f55b4f31abac9ba428d4ccf6aa51cd0