drm/i915/selftests: Fix wrong return value of perf_series_engines()
If intel context create failed, the perf_series_engines() will return 0 rather than error, because we doesn't initialize the return value. Fixes: cbfd3a0c ("drm/i915/selftests: Add request throughput measurement to perf") Reported-by: NHulk Robot <hulkci@huawei.com> Signed-off-by: NZhang Xiaoxu <zhangxiaoxu5@huawei.com> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20201116144112.3673011-1-zhangxiaoxu5@huawei.com
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