[PATCH] RISC-V: KVM: Fix null pointer dereference in kvm_riscv_vcpu_aia_rmw_topei()

[Jiakai Xu]

Hi all,

Just a gentle ping on the patch below, sent about three weeks ago.

This fixes a NULL pointer dereference in the AIA TOPEI RMW path that can
be triggered by fuzzed ioctl sequences before per-vCPU IMSIC state is
initialized.

Any feedback would be appreciated.

Thanks,
Jiakai