the same as for usb gadget autostarter.

|commit 2b9bcff
|Author: Sascha Hauer <s.hauer@pengutronix.de>
|Date:   Fri Jan 20 10:03:45 2017 +0100
|
|    usb: gadget: properly release f_multi_opts
|
|    The usbgadget commands uses statically allocated f_multi_opts and passes
|    this to usb_multi_register(). These f_multi_opts are of course no
|    longer valid when we leave the usbgadget command. Luckily we do not use
|    the data after we left the usbgadget command, so this never has been a
|    problem. However, f_multi_opts has some allocated members which we can
|    not free anymore on gadget unregistration because we no longer have the
|    pointer to them.
|
|    Fix this by adding a release function to struct f_multi_opts. This way
|    we can allocate all memory dynamically and properly free it when not
|    used anymore.
|
|    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>