drm/i915/selftests: Avoid ERR_PTR dereference
Along the early error path for igt_switch_to_kernel_context we may try to dereference an invalid error pointer. Instead, return early rather than dump the GEM trace since we haven't yet emitted anything of interest. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Fixes: 09a4c02e ("drm/i915: Look for an active kernel context before switching") Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180620112441.13085-1-chris@chris-wilson.co.uk
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