kunit: Fix the wrong kfree of copy for kunit_filter_suites()

[ Upstream commit e44679515a ]

If the outer layer for loop is iterated more than once and it fails not
in the first iteration, the copy pointer has been moved. So it should free
the original copy's backup copy_start.

Fixes: abbf73816b ("kunit: fix possible memory leak in kunit_filter_suites()")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

lib/kunit/executor.c

@@ -243,7 +243,7 @@ kunit_filter_suites(const struct kunit_suite_set *suite_set,
 
 free_copy:
 	if (*err)
-		kfree(copy);
+		kfree(copy_start);
 
 	return filtered;
 }