vty/command.c: Fix compile warning by including gsm_subsriber.h
diff --git a/openbsc/src/vty/command.c b/openbsc/src/vty/command.c
index 94a5c2a..e9b3652 100644
--- a/openbsc/src/vty/command.c
+++ b/openbsc/src/vty/command.c
@@ -45,6 +45,7 @@
 //#include "workqueue.h"
 
 #include <openbsc/gsm_data.h>
+#include <openbsc/gsm_subscriber.h>
 
 /* Command vector which includes some level of command lists. Normally
    each daemon maintains each own cmdvec. */