[PATCH] usb: xhci: fix build warning - missing prototype

[Jean-Philippe Menil]

Fix build warning when building drivers/usb/host/xhci-mem.o due to missing
prototype for xhci_free_virt_devices_depth_first.

This function is only used in xhci-mem.c so just make it static.

Signed-off-by: Jean-Philippe Menil <jpmenil@xxxxxxxxx>
---
 drivers/usb/host/xhci-mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index b1f27aa38b10..c5236f5d917a 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -933,7 +933,7 @@ void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
  * that tt_info, then free the child first. Recursive.
  * We can't rely on udev at this point to find child-parent relationships.
  */
-void xhci_free_virt_devices_depth_first(struct xhci_hcd *xhci, int slot_id)
+static void xhci_free_virt_devices_depth_first(struct xhci_hcd *xhci, int slot_id)
 {
 	struct xhci_virt_device *vdev;
 	struct list_head *tt_list_head;
-- 
2.17.1