drm/i915/selftests: Handle a potential failure of intel_ring_begin
Silence smatch over: drivers/gpu/drm/i915/selftests/intel_workarounds.c:58 read_nonprivs() error: 'cs' dereferencing possible ERR_PTR() by handling a potential (but unlikely) failure of intel_ring_begin. Fixes: f4ecfbfc ("drm/i915: Check whitelist registers across resets") Signed-off-by: Oscar Mateo <oscar.mateo@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/1523915821-30624-1-git-send-email-oscar.mateo@intel.com
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