drm/i915/selftest: Fix use of err in igt_reset_{fail, nop}_engine()

Clang warns:

In file included from drivers/gpu/drm/i915/gt/intel_reset.c:1514:
drivers/gpu/drm/i915/gt/selftest_hangcheck.c:465:62: warning: variable
'err' is uninitialized when used here [-Wuninitialized]
        pr_err("[%s] Create context failed: %d!\n", engine->name, err);
                                                                  ^~~
...
drivers/gpu/drm/i915/gt/selftest_hangcheck.c:580:62: warning: variable
'err' is uninitialized when used here [-Wuninitialized]
        pr_err("[%s] Create context failed: %d!\n", engine->name, err);
                                                                  ^~~
...
2 warnings generated.

This appears to be a copy and paste issue. Use ce directly using the %pe
specifier to pretty print the error code so that err is not used
uninitialized in these functions.

Fixes: 3a7b726 ("drm/i915/selftest: Bump selftest timeouts for hangcheck")
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Nathan Chancellor <[email protected]>
Reviewed-by: Joonas Lahtinen <[email protected]>
Signed-off-by: Joonas Lahtinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit ac5a2df)
Signed-off-by: Jani Nikula <[email protected]>

Author: nathanchance

drivers/gpu/drm/i915/gt/selftest_hangcheck.c

@@ -462,7 +462,7 @@ static int igt_reset_nop_engine(void *arg)
 
 		ce = intel_context_create(engine);
 		if (IS_ERR(ce)) {
-			pr_err("[%s] Create context failed: %d!\n", engine->name, err);
+			pr_err("[%s] Create context failed: %pe!\n", engine->name, ce);
 			return PTR_ERR(ce);
 		}
 
@@ -577,7 +577,7 @@ static int igt_reset_fail_engine(void *arg)
 
 		ce = intel_context_create(engine);
 		if (IS_ERR(ce)) {
-			pr_err("[%s] Create context failed: %d!\n", engine->name, err);
+			pr_err("[%s] Create context failed: %pe!\n", engine->name, ce);
 			return PTR_ERR(ce);
 		}