usb: gadget: udc: renesas_usb3: fix oops in renesas_usb3_remove()

usb: gadget: udc: renesas_usb3: fix oops in renesas_usb3_remove()

BugLink: http://bugs.launchpad.net/bugs/1757465
commit e3190868e5f52fb26544f16463593d54ce46ce61 upstream.

This patch fixes an issue that the renesas_usb3_remove() causes
NULL pointer dereference because the usb3_to_dev() macro will use
the gadget instance and it will be deleted before.

Fixes: cf06df3fae28 ("usb: gadget: udc: renesas_usb3: move pm_runtime_{en,dis}able()")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>