UBI: Fix PEB leak in wear_leveling_worker()

get_peb_for_wl() removes the PEB from the free list.
If the WL subsystem detects that no wear leveling is needed
it cancels the operation and drops the gained PEB.
In this case we have to put the PEB back into the free list.

This issue was introduced with commit ed4b7021
(UBI: remove PEB from free tree in get_peb_for_wl()).

Change-Id: I4124e43c94350c5bfb105a50b2db5cac9b35a9a1
Cc: <stable@vger.kernel.org> # 3.7.x
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Git-commit: 5ef4414f4bc26a19cfd5cd11aee9697a863e4d51
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>