From ec9f932ed41622d120de52a5b525e4d77b9ef17e Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Wed, 24 Jun 2015 08:59:25 +0200
Subject: [PATCH] drm/atomic: Cleanup on error properly in the atomic ioctl.

It's probably allowed to leave old_fb set to garbage when unlocking,
but to prevent undefined behavior unset it just in case.

Also crtc_state->event could be NULL on memory allocation failure,
in which case event_space is increased for no reason.

Note: Contains some general simplification of the cleanup code too.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Add note about the other changes in here. And fix long line
while at it.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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