KVM: x86.c make kvm_load_realmode_segment static

Noticed by sparse:
arch/x86/kvm/x86.c:3591:5: warning: symbol 'kvm_load_realmode_segment' was not declared. Should it be static?
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/x86.c

@@ -3611,7 +3611,7 @@ static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
+static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
 {
 	struct kvm_segment segvar = {
 		.base = selector << 4,