usb: s3c-otg: Staticize s3c_udc_ep_set_stall

This function is local to s3c_udc_otg_xfer_dma.c , staticize it.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/gadget/s3c_udc_otg_priv.h b/drivers/usb/gadget/s3c_udc_otg_priv.h
index 68bac69..cc10704 100644
--- a/drivers/usb/gadget/s3c_udc_otg_priv.h
+++ b/drivers/usb/gadget/s3c_udc_otg_priv.h
@@ -97,6 +97,4 @@
 extern void otg_phy_init(struct dwc2_udc *dev);
 extern void otg_phy_off(struct dwc2_udc *dev);
 
-extern void s3c_udc_ep_set_stall(struct dwc2_ep *ep);
-
 #endif	/* __S3C_UDC_OTG_PRIV__ */
diff --git a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
index 0288d44..1390239 100644
--- a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
+++ b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
@@ -946,7 +946,7 @@
 }
 
 
-void s3c_udc_ep_set_stall(struct dwc2_ep *ep)
+static void s3c_udc_ep_set_stall(struct dwc2_ep *ep)
 {
 	u8		ep_num;
 	u32		ep_ctrl = 0;