KVM: Fix kvm_arch_vcpu_ioctl_set_sregs so that set_cr0 works properly

Whilst working on getting a VM to initialize in to IA32e mode I found
this issue. set_cr0 relies on comparing the old cr0 to the new one to
work correctly.  Move the assignment below so the compare can work.
Signed-off-by: NPaul Knowles <paul@transitive.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>

arch/x86/kvm/x86.c

@@ -2861,8 +2861,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 	kvm_x86_ops->decache_cr4_guest_bits(vcpu);
 
 	mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
-	vcpu->arch.cr0 = sregs->cr0;
 	kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
+	vcpu->arch.cr0 = sregs->cr0;
 
 	mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
 	kvm_x86_ops->set_cr4(vcpu, sregs->cr4);