tools: use #pragma once in headers

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>

tools/virt-admin.h

@@ -18,13 +18,12 @@
  * <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBVIRT_VIRT_ADMIN_H
-# define LIBVIRT_VIRT_ADMIN_H
+#pragma once
 
-# include "internal.h"
-# include "vsh.h"
+#include "internal.h"
+#include "vsh.h"
 
-# define VIR_FROM_THIS VIR_FROM_NONE
+#define VIR_FROM_THIS VIR_FROM_NONE
 
 /*
  * Command group types
@@ -40,5 +39,3 @@ struct _vshAdmControl {
     virAdmConnectPtr conn;      /* connection to a daemon's admin server */
     bool wantReconnect;
 };
-
-#endif /* LIBVIRT_VIRT_ADMIN_H */