usb: typec: tcpci_maxim: remove redundant assignment

PTR_ERR(chip->tcpci) has been used as a return value,
it is not necessary to assign it to ret, so remove it.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Junlin Yang <yangjunlin@yulong.com>
Link: https://lore.kernel.org/r/20210124143853.1630-1-angkery@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>