From ee59ba8b064f692a1dee99b6f3ba30b0e904b2c1 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Mon, 10 Nov 2014 16:16:23 +0100
Subject: [PATCH] UBI: Fix stale pointers in ubi->lookuptbl

In some error paths the WL sub-system gives up on a PEB
and frees it's ubi_wl_entry struct but does not set
the entry in ubi->lookuptbl to NULL.
Fastmap can stumble over such a stale pointer as it uses
ubi->lookuptbl to find all PEBs.

Fix this by introducing a new helper function which free()s
a WL entry and removes the reference from the lookup table.

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