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>
diff --git a/drivers/staging/usbip/stub.h b/drivers/staging/usbip/stub.h
index 132adc5..d407368 100644
--- a/drivers/staging/usbip/stub.h
+++ b/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 @@
 			     __u32 status);
 void stub_complete(struct urb *urb);
 int stub_tx_loop(void *data);
+
+#endif /* __USBIP_STUB_H */
diff --git a/drivers/staging/usbip/vhci.h b/drivers/staging/usbip/vhci.h
index 71a586e..88b3298 100644
--- a/drivers/staging/usbip/vhci.h
+++ b/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 @@
 {
 	return vhci_to_hcd(vhci)->self.controller;
 }
+
+#endif /* __USBIP_VHCI_H */