Menu: Fix a crash when we've got no entries or are out of bounds

src/menu-fn/m_internetgames.cpp

@@ -133,7 +133,6 @@ void inet_lb_changed(int val)
 	inet_lbServers_Map.SetScroll(val);
 	inet_lbServers_Game.SetScroll(val);
 	inet_lbServers_Players.SetScroll(val);
-	inet_lbServers_Addresses.SetScroll(val);
 }
 
 void menu_internetgames_init(void)

src/menu-fn/w_listbox.cpp

@@ -119,7 +119,9 @@ void CListBox::SetSize(int w, int h)
 
 void CListBox::SetScroll(int i)
 {
-	m_scroll = i;
+	if (i >= 0 && i < LB_MAX_ENTRIES) {
+		m_scroll = i;
+	}
 }
 
 void CListBox::SetChanged(void(int val) func)