net: tun: Fix memory leaks of napi_get_frags
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 v4.19.267 by commit 223ef6a94e52331a6a7ef31e59921e0e82d2d40a, it was introduced in version v4.15 by commit 90e33d45940793def6f773b2d528e9f3c84ffdc7. For more details please see the references link.