extcon: usbc-tusb320: Call the Type-C IRQ handler only if a port is registered

Commit bf7571c0 ("extcon: usbc-tusb320: Add USB TYPE-C support")
added an optional Type-C interface to the driver but missed to check
if it is in use when calling the IRQ handler. This causes an oops on
devices currently using the old extcon interface. Check if a Type-C
port is registered before calling the Type-C IRQ handler.

Fixes: bf7571c0 ("extcon: usbc-tusb320: Add USB TYPE-C support")
Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221107153317.657803-1-y.oudjana@protonmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/extcon/extcon-usbc-tusb320.c

@@ -327,7 +327,13 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
 		return IRQ_NONE;
 
 	tusb320_extcon_irq_handler(priv, reg);
-	tusb320_typec_irq_handler(priv, reg);
+
+	/*
+	 * Type-C support is optional. Only call the Type-C handler if a
+	 * port had been registered previously.
+	 */
+	if (priv->port)
+		tusb320_typec_irq_handler(priv, reg);
 
 	regmap_write(priv->regmap, TUSB320_REG9, reg);