Undefined behaviour in `kvm_ioctls::ioctls::vm::VmFd::create_device`

An issue was identified in the VmFd::createdevice function, leading to undefined behavior and miscompilations on rustc 1.82.0 and newer due to the function's violation of Rust's pointer safety rules. The function downcasted a mutable reference to its struct kvmcreatedevice argument to an immutabl...