trx: exit() on unsupported positional arguments on command line

Change-Id: Ifeea65a359e9ca307efb2c721fd0fb6f0959e976
diff --git a/Transceiver52M/osmo-trx.cpp b/Transceiver52M/osmo-trx.cpp
index 2346488..16047a9 100644
--- a/Transceiver52M/osmo-trx.cpp
+++ b/Transceiver52M/osmo-trx.cpp
@@ -381,6 +381,11 @@
 		}
 	}
 
+	if (argc > optind) {
+		LOG(ERROR) << "Unsupported positional arguments on command line";
+		goto bad_config;
+	}
+
 	/* Cmd line option specific validation & setup */
 
 	if (trx->cfg.num_chans > TRX_CHAN_MAX) {