fix -H usage and mem leak

src/lnav.cc

@@ -2454,7 +2454,7 @@ SELECT tbl_name FROM sqlite_master WHERE sql LIKE 'CREATE VIRTUAL TABLE%'
         return print_user_msgs(perform_res);
     }
 
-    if (!mode_flags.mf_check_configs) {
+    if (!mode_flags.mf_check_configs && !lnav_data.ld_show_help_view) {
         DEFAULT_FILES.emplace_back("var/log/messages");
         DEFAULT_FILES.emplace_back("var/log/system.log");
         DEFAULT_FILES.emplace_back("var/log/syslog");

src/lnav_config.cc

@@ -1490,7 +1490,9 @@ save_config()
 
     auto config_str = gen.to_string_fragment().to_string();
     char errbuf[1024];
-    auto* tree = yajl_tree_parse(config_str.c_str(), errbuf, sizeof(errbuf));
+    auto_mem<yajl_val_s> tree(yajl_tree_free);
+
+    tree = yajl_tree_parse(config_str.c_str(), errbuf, sizeof(errbuf));
 
     if (tree == nullptr) {
         return fmt::format(