kvm: kvm_main: Remove unnecessary (void*) conversions

void * pointer assignment does not require a forced replacement.

Signed-off-by: Li kunyu <kunyu@nfschina.com>
Link: https://lore.kernel.org/r/20221213080236.3969-1-kunyu@nfschina.com


Signed-off-by: Sean Christopherson <seanjc@google.com>