kconfig: qconf: don't show goback button on splitMode

the goback button does nothing on splitMode. So, why display
it?
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/qconf.cc

@@ -437,10 +437,11 @@ void ConfigList::updateList(ConfigItem* item)
 	if (rootEntry != &rootmenu && (mode == singleMode ||
 	    (mode == symbolMode && rootEntry->parent != &rootmenu))) {
 		item = (ConfigItem *)topLevelItem(0);
-		if (!item)
+		if (!item && mode != symbolMode) {
 			item = new ConfigItem(this, 0, true);
 			last = item;
 		}
+	}
 	if ((mode == singleMode || (mode == symbolMode && !(rootEntry->flags & MENU_ROOT))) &&
 	    rootEntry->sym && rootEntry->prompt) {
 		item = last ? last->nextSibling() : firstChild();