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/utils/smpp_mirror.c b/openbsc/src/utils/smpp_mirror.c
index 2f154db..95df5f2 100644
--- a/openbsc/src/utils/smpp_mirror.c
+++ b/openbsc/src/utils/smpp_mirror.c
@@ -302,6 +302,8 @@
 	int port = 0;
 	int rc;
 
+	msgb_talloc_ctx_init(NULL, 0);
+
 	memset(&esme, 0, sizeof(esme));
 
 	osmo_init_logging(&log_info);