kunit: Fix potential null dereference in kunit_device_driver_test()

kunit_kzalloc() may return a NULL pointer, dereferencing it without
NULL check may lead to NULL dereference.
Add a NULL check for test_state.

Link: https://lore.kernel.org/r/[email protected]
Fixes: d03c720 ("kunit: Add APIs for managing devices")
Signed-off-by: Zichen Xie <[email protected]>
Cc: [email protected]
Reviewed-by: David Gow <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: Gax-c

lib/kunit/kunit-test.c

@@ -805,6 +805,8 @@ static void kunit_device_driver_test(struct kunit *test)
 	struct device *test_device;
 	struct driver_test_state *test_state = kunit_kzalloc(test, sizeof(*test_state), GFP_KERNEL);
 
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_state);
+
 	test->priv = test_state;
 	test_driver = kunit_driver_create(test, "my_driver");