platform/chrome: cros_ec_typec: Check for EC driver

commit 7464ff8 upstream.

The EC driver may not be initialized when cros_typec_probe is called,
particulary when CONFIG_CROS_EC_CHARDEV=m.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Link: https://lore.kernel.org/r/20220404041101.6276-1-akihiko.odaki@gmail.com
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Laura Nao <laura.nao@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: akihikodaki

drivers/platform/chrome/cros_ec_typec.c

@@ -1123,6 +1123,9 @@ static int cros_typec_probe(struct platform_device *pdev)
 	}
 
 	ec_dev = dev_get_drvdata(&typec->ec->ec->dev);
+	if (!ec_dev)
+		return -EPROBE_DEFER;
+
 	typec->typec_cmd_supported = !!cros_ec_check_features(ec_dev, EC_FEATURE_TYPEC_CMD);
 	typec->needs_mux_ack = !!cros_ec_check_features(ec_dev,
 							EC_FEATURE_TYPEC_MUX_REQUIRE_AP_ACK);