Fastmap update v2 (pile 2)

[Richard Weinberger]

Artem,

this is pile 2 of 7.

[PATCH 1/6] UBI: Fastmap: Fix memory leaks while closing the WL
[PATCH 2/6] UBI: Fastmap: Don't allocate new ubi_wl_entry objects
[PATCH 3/6] UBI: Fastmap: Notify user in case of an
[PATCH 4/6] UBI: Fastmap: Wrap fastmap specific function in a ifdef
[PATCH 5/6] UBI: Fastmap: Fix fastmap usage in ubi_volume_notify()
[PATCH 6/6] UBI: Fastmap: Fix memory leak while attaching

Thanks,
//richard