usb: typec: class: Unlocked on error in typec_register_partner()

usb: typec: class: Unlocked on error in typec_register_partner()

We recently added some locking to this function but this error path
was accidentally missed.  Unlock before returning.

Fixes: ec27386de23a ("usb: typec: class: Fix NULL pointer access")
Cc: stable <stable@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/Z_44tOtmml89wQcM@stanley.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>