drm/i915/selftests: Fix return value check in live_breadcrumbs_smoketest()

In case of error, the function live_context() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Fixes: 52c0fdb ("drm/i915: Replace global breadcrumbs with per-context interrupt tracking")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zhihao Cheng <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
[tursulin: Wrap commit text, fix Fixes: tag.]
Signed-off-by: Tvrtko Ursulin <[email protected]>
(cherry picked from commit 8f4caef)
Signed-off-by: Jani Nikula <[email protected]>

Author: Zhihao Cheng

drivers/gpu/drm/i915/selftests/i915_request.c

@@ -1592,8 +1592,8 @@ static int live_breadcrumbs_smoketest(void *arg)
 
 	for (n = 0; n < smoke[0].ncontexts; n++) {
 		smoke[0].contexts[n] = live_context(i915, file);
-		if (!smoke[0].contexts[n]) {
-			ret = -ENOMEM;
+		if (IS_ERR(smoke[0].contexts[n])) {
+			ret = PTR_ERR(smoke[0].contexts[n]);
 			goto out_contexts;
 		}
 	}