sgsnemu: Fix printing of tun device name

Change-Id: I6cd89b7b59a6c1d506cfbe9d3088cb844d133313
Fixes: Coverity CID#178638
diff --git a/sgsnemu/sgsnemu.c b/sgsnemu/sgsnemu.c
index 9be8335..aeee79f 100644
--- a/sgsnemu/sgsnemu.c
+++ b/sgsnemu/sgsnemu.c
@@ -293,7 +293,7 @@
 		printf("timelimit: %d\n", args_info.timelimit_arg);
 		printf("createif: %d\n", args_info.createif_flag);
 		if (args_info.tun_device_arg)
-			printf("tun-device: %d\n", args_info.tun_device_arg);
+			printf("tun-device: %s\n", args_info.tun_device_arg);
 		if (args_info.ipup_arg)
 			printf("ipup: %s\n", args_info.ipup_arg);
 		if (args_info.ipdown_arg)