[PATCH][next] drm/i915: fix uninitialized pointer reads on pointers to and from

[Chris Wilson]

Quoting Colin King (2019-12-19 19:09:16)
> From: Colin Ian King <colin.king at canonical.com>
> 
> Currently pointers to and from are not initialized and may contain
> garbage values. This will cause uninitialized pointer reads in the
> call to intel_frontbuffer_track and later checks to see if to and from
> are null.  Fix this by ensuring to and from are initialized to NULL.
> 
> Addresses-Coverity: ("Uninitialised pointer read)"
> Fixes: da42104f589d ("drm/i915: Hold reference to intel_frontbuffer as we track activity")
> Signed-off-by: Colin Ian King <colin.king at canonical.com>

"D'oh"
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris