kconfig: remove unneeded variable in get_prompt_str()

The variable 'accessible' is redundant.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/menu.c

@@ -724,10 +724,8 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 
 	menu = prop->menu;
 	for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
-		bool accessible = menu_is_visible(menu);
-
 		submenu[i++] = menu;
-		if (location == NULL && accessible)
+		if (location == NULL && menu_is_visible(menu))
 			location = menu;
 	}
 	if (head && location) {