drm/i915: Fix an error handling path in igt_write_huge()

All error handling paths go to 'out', except this one. Be consistent and
also branch to 'out' here.

Fixes: c10a652 ("drm/i915/selftests: Rework context handling in hugepages selftests")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/7a036b88671312ee9adc01c74ef5b3376f690b76.1689619758.git.christophe.jaillet@wanadoo.fr
(cherry picked from commit 361ecaa)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drivers/gpu/drm/i915/gem/selftests/huge_pages.c

@@ -1246,8 +1246,10 @@ static int igt_write_huge(struct drm_i915_private *i915,
 	 * times in succession a possibility by enlarging the permutation array.
 	 */
 	order = i915_random_order(count * count, &prng);
-	if (!order)
-		return -ENOMEM;
+	if (!order) {
+		err = -ENOMEM;
+		goto out;
+	}
 
 	max_page_size = rounddown_pow_of_two(obj->mm.page_sizes.sg);
 	max = div_u64(max - size, max_page_size);