[PATCH][next] drm/i915: remove redundant variable err

[Chris Wilson]

Quoting Colin King (2019-10-09 10:39:35)
> From: Colin Ian King <colin.king at canonical.com>
> 
> An earlier commit removed any error assignments to err and we
> are now left with a zero assignment to err and a check that is
> always false. Clean this up by removing the redundant variable
> err and the error check.

Oh, we add one again shortly. Might as well wait.
-Chris