CHROMIUM: drm/exynos: Fixup init failure cleanup path

CHROMIUM: drm/exynos: Fixup init failure cleanup path

Backport from 3.8-rebase version of this patch.

Signed-off-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
TEST=by hand
BUG=none

Original-Change-Id: Ia0c0de4f49efe0d6dca09507372add5d0d533028
Reviewed-on: https://gerrit.chromium.org/gerrit/49146
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Commit-Queue: Stéphane Marchesin <marcheu@chromium.org>
Tested-by: Stéphane Marchesin <marcheu@chromium.org>
(cherry picked from commit fa2b424b2108697ee5a971bc00b9a8bb75f66b41)

Change-Id: I09d0d33a9499945e67fb8416c0074a440fd5b5a2
Reviewed-on: https://gerrit.chromium.org/gerrit/50188
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Commit-Queue: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>