UBI: Fastmap: Notify user in case of an ubi_update_fastmap() failure

If ubi_update_fastmap() fails notify the user.
This is not a hard error as ubi_update_fastmap() makes sure that upon failure
the current on-flash fastmap will no be used upon next UBI attach.

Signed-off-by: Richard Weinberger <richard@nod.at>
1 file changed