nexthop: Fix data-races around nexthopcompatmode.
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 v5.10.132 by commit a51040d4b120f3520df64fb0b9c63b31d69bea9b, it was introduced in version v5.8 by commit 4f80116d3df3b23ee4b83ea8557629e1799bc230. For more details please see the references link.