sit: do not call ipip6devfree() from sitinitnet()
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 v4.14.259 by commit 4e1797914d8f223726ff6ae5ece4f97d73f21bab, it was introduced in version v4.12 by commit cf124db566e6b036b8bcbe8decbed740bdfac8c6. For more details please see the references link.