KVM: VMX: avoid guest hang on invalid invept instruction

A guest executing an invalid invept instruction would hang
because the instruction pointer was not updated.

Cc: [e-mail]
Fixes: bfd0a56b90005f8c8a004baf407ad90045c2b11e
Reviewed-by: David Matlack <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>

arch/x86/kvm/vmx.c

···
 	if (!(types & (1UL << type))) {
 		nested_vmx_failValid(vcpu,
 				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
+		skip_emulated_instruction(vcpu);
 		return 1;
 	}