rspro_client_fsm/remsim_client: Fix double-free

respro_dec_msg() takes ownership of the input msgb in both
successful and unsuccessful cases, so we must not call talloc_free
on the resulting msgb.

Change-Id: Id54d1b73395da1329a998d213c190da49eb90a93
diff --git a/src/remsim_client.c b/src/remsim_client.c
index 88ac4cd..e73fcc4 100644
--- a/src/remsim_client.c
+++ b/src/remsim_client.c
@@ -90,6 +90,7 @@
 		default:
 			break;
 		}
+		msgb_free(msg);
 		break;
 	case IPAC_PROTO_OSMO:
 		if (!he || msgb_l2len(msg) < sizeof(*he))