[PATCH][next] drm/i915/selftests: fix null pointer dereference on pointer data

[Chris Wilson]

Quoting Colin King (2019-10-09 11:00:24)
> From: Colin Ian King <colin.king at canonical.com>
> 
> In the case where data fails to be allocated the error exit path is
> via label 'out' where data is dereferenced in a for-loop.  Fix this
> by exiting via the label 'out_file' instead to avoid the null pointer
> dereference.
> 
> Addresses-Coverity: ("Dereference after null check")
> Fixes: 50d16d44cce4 ("drm/i915/selftests: Exercise context switching in parallel")
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris