USB: musb: musb_gadget: fix sparse warning

Fix the following sparse warnings:

drivers/usb/musb/musb_gadget.c:1161:5: warning: symbol 'musb_gadget_set_halt' was not declared. Should it be static?

drivers/usb/musb/musb_gadget.c:1244:5: warning: symbol 'musb_gadget_set_wedge' was not declared. Should it be static?
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_gadget.c

@@ -1211,7 +1211,7 @@ done:
  *
  * exported to ep0 code
  */
-int musb_gadget_set_halt(struct usb_ep *ep, int value)
+static int musb_gadget_set_halt(struct usb_ep *ep, int value)
 {
 	struct musb_ep		*musb_ep = to_musb_ep(ep);
 	u8			epnum = musb_ep->current_epnum;
@@ -1296,7 +1296,7 @@ done:
 /*
  * Sets the halt feature with the clear requests ignored
  */
-int musb_gadget_set_wedge(struct usb_ep *ep)
+static int musb_gadget_set_wedge(struct usb_ep *ep)
 {
 	struct musb_ep		*musb_ep = to_musb_ep(ep);