GSD-2022-1003999 ipw2x00: Fix potential NULL dereference in libipw_xmit()

ipw2x00: Fix potential NULL dereference in libipwxmit 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 v4.14.283 by commit...