drm/i915/selftests: Skip making an object busy if the GPU is wedged

If the GPU is wedged, we cannot make the object busy as trying to
submit a request will generate -EIO. Skip to the end of the test.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180706065332.15214-4-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/selftests/i915_gem_object.c

@@ -553,6 +553,9 @@ static int igt_mmap_offset_exhaustion(void *arg)
 
 	/* Now fill with busy dead objects that we expect to reap */
 	for (loop = 0; loop < 3; loop++) {
+		if (i915_terminally_wedged(&i915->gpu_error))
+			break;
+
 		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 		if (IS_ERR(obj)) {
 			err = PTR_ERR(obj);