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

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

Commit 3b2aef29511d ("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: 3b2aef29511d ("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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>