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[ Upstream commit f8261c37 ]

The etnaviv_gem_get_pages() never returns NULL.  It returns error
pointers on error.

Fixes: a8c21a54

 ("drm/etnaviv: add initial etnaviv DRM driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>