KVM: mmio_fault_cr2 is not used

Remove unused variable mmio_fault_cr2.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a831d5d..e3ac212 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4561,7 +4561,7 @@
 	bool writeback = true;
 
 	kvm_clear_exception_queue(vcpu);
-	vcpu->arch.mmio_fault_cr2 = cr2;
+
 	/*
 	 * TODO: fix emulate.c to use guest_read/write_register
 	 * instead of direct ->regs accesses, can save hundred cycles