msgb talloc ctx: initialize in all main() scopes

Add msgb_talloc_ctx_init() call to many main() functions still lacking a
msgb talloc context.

Change-Id: Ib0d6751260659cabf18a7ce80680ba2fb4228ea1
diff --git a/openbsc/src/ipaccess/ipaccess-proxy.c b/openbsc/src/ipaccess/ipaccess-proxy.c
index 4077b3f..52e77e8 100644
--- a/openbsc/src/ipaccess/ipaccess-proxy.c
+++ b/openbsc/src/ipaccess/ipaccess-proxy.c
@@ -1200,6 +1200,7 @@
 	int rc;
 
 	tall_bsc_ctx = talloc_named_const(NULL, 1, "ipaccess-proxy");
+	msgb_talloc_ctx_init(tall_bsc_ctx, 0);
 
 	osmo_init_logging(&log_info);
 	log_parse_category_mask(osmo_stderr_target, "DLINP:DLMI");