Add -V param to print version

Change-Id: I9f2d6c4b1a508aceb1ccc0559f0902eedf2ec5af
diff --git a/Transceiver52M/osmo-trx.cpp b/Transceiver52M/osmo-trx.cpp
index 09ba14e..1c40fcf 100644
--- a/Transceiver52M/osmo-trx.cpp
+++ b/Transceiver52M/osmo-trx.cpp
@@ -49,6 +49,8 @@
 #include <osmocom/ctrl/ports.h>
 #include <osmocom/ctrl/control_if.h>
 #include <osmocom/vty/stats.h>
+#include <osmocom/vty/command.h>
+
 #include "convolve.h"
 #include "convert.h"
 #include "trx_vty.h"
@@ -194,6 +196,7 @@
 	fprintf(stdout, "Options:\n"
 		"  -h    This text\n"
 		"  -C    Filename The config file to use\n"
+		"  -V    Print the version of OsmoTRX\n"
 		);
 }
 
@@ -211,7 +214,7 @@
 	std::vector<std::string> rx_paths, tx_paths;
 	bool rx_paths_set = false, tx_paths_set = false;
 
-	while ((option = getopt(argc, argv, "ha:l:i:j:p:c:dmxgfo:s:b:r:A:R:Set:y:z:C:")) != -1) {
+	while ((option = getopt(argc, argv, "ha:l:i:j:p:c:dmxgfo:s:b:r:A:R:Set:y:z:C:V")) != -1) {
 		switch (option) {
 		case 'h':
 			print_help();
@@ -311,6 +314,10 @@
 		case 'C':
 			config_file = optarg;
 			break;
+		case 'V':
+			print_version(1);
+			exit(0);
+			break;
 		default:
 			goto bad_config;
 		}