KVM: nVMX: delete meaningless nested_vmx_run() declaration

The function nested_vmx_run() declaration is below its implementation. So
this is meaningless and should be removed.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/nested.c

@@ -4723,8 +4723,6 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
 	return nested_vmx_succeed(vcpu);
 }
 
-static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
-
 /* Emulate the VMLAUNCH instruction */
 static int handle_vmlaunch(struct kvm_vcpu *vcpu)
 {