staging: usbip: Add header guards to stub.h and vhci.h

stub.h and vhci.h are missing proper #ifndef/#define header guards, so
add them.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/usbip/stub.h

@@ -17,6 +17,9 @@
  * USA.
  */
 
+#ifndef __USBIP_STUB_H
+#define __USBIP_STUB_H
+
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -106,3 +109,5 @@ void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
 			     __u32 status);
 void stub_complete(struct urb *urb);
 int stub_tx_loop(void *data);
+
+#endif /* __USBIP_STUB_H */

drivers/staging/usbip/vhci.h

@@ -8,6 +8,9 @@
  *
  */
 
+#ifndef __USBIP_VHCI_H
+#define __USBIP_VHCI_H
+
 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
@@ -129,3 +132,5 @@ static inline struct device *vhci_dev(struct vhci_hcd *vhci)
 {
 	return vhci_to_hcd(vhci)->self.controller;
 }
+
+#endif /* __USBIP_VHCI_H */