GSD-2022-1000033 usb: gadget: f_fs: Clear ffs_eventfd in ffs_data_clear.

usb: gadget: ffs: Clear ffseventfd in ffsdataclear. This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.170 by commit...