net: fix multiple definitions of setup_w6692

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/hardware/mISDN/w6692.c b/drivers/isdn/hardware/mISDN/w6692.c
index 1b9008f..d3f1077 100644
--- a/drivers/isdn/hardware/mISDN/w6692.c
+++ b/drivers/isdn/hardware/mISDN/w6692.c
@@ -1234,7 +1234,7 @@
 	return err;
 }
 
-int
+static int
 setup_w6692(struct w6692_hw *card)
 {
 	u32	val;