vty: fix access to wrong argv in paging response-timer

Fixes: 2ff5bcdc387a7eb5135e5a54d55027502952c86b
Change-Id: I667cf4c8e3e7b6e77ea6ed8ae603727ad22a2ee2
diff --git a/src/libmsc/msc_vty.c b/src/libmsc/msc_vty.c
index 09aef91..51504ef 100644
--- a/src/libmsc/msc_vty.c
+++ b/src/libmsc/msc_vty.c
@@ -557,7 +557,7 @@
       "Set to default timeout (" OSMO_STRINGIFY_VAL(MSC_PAGING_RESPONSE_TIMER_DEFAULT) " seconds)\n"
       "Set paging timeout in seconds\n")
 {
-	if (!strcmp(argv[1], "default"))
+	if (!strcmp(argv[0], "default"))
 		gsmnet->paging_response_timer = MSC_PAGING_RESPONSE_TIMER_DEFAULT;
 	else
 		gsmnet->paging_response_timer = atoi(argv[0]);