work around bogus compiler warnings

Change-Id: I9170e4de857c1f3e003a480b12dd16fe796ec763
diff --git a/daemon/daemon_vty.c b/daemon/daemon_vty.c
index efd9c0f..c84c727 100644
--- a/daemon/daemon_vty.c
+++ b/daemon/daemon_vty.c
@@ -127,7 +127,7 @@
 	"Local IP address\n" "Local UDP Port\n")
 {
 	struct gtp_endpoint *ep;
-	struct addrinfo *ai;
+	struct addrinfo *ai = NULL;
 	const char *ipstr;
 	uint16_t port = GTP1U_PORT;