KVM: VMX: Remove unnecessary code in vmx_tlb_flush()

A vmexit implicitly flushes the tlb; the code is bogus.

Noted by Shaohua Li.

Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 42a9163..7d04ffa 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1987,7 +1987,6 @@
 
 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
 {
-	vmcs_writel(GUEST_CR3, vmcs_readl(GUEST_CR3));
 }
 
 static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)