When rebuilding the package, iucode_tool fails with a "File exists" error if the directory already contained firmware from the previous build (incl. in the successful build case). Fix this by removing the directory before invoking iucode_tool. Fixes the following build error: iucode_tool: 06-0f-02: cannot write to, or create file: File exists make[2]: *** [Makefile:57: .../.built] Error 2 Signed-off-by: Rany Hany <rany_hany@riseup.net> Link: https://github.com/openwrt/openwrt/pull/24077 Signed-off-by: Robert Marko <robimarko@gmail.com>