bnx2x: fix sparse warning

Fix new sparse warning about function declared static.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c

@@ -8602,7 +8602,7 @@ static void bnx2x_set_limiting_mode(struct link_params *params,
 	}
 }
 
-int bnx2x_sfp_module_detection(struct bnx2x_phy *phy,
+static int bnx2x_sfp_module_detection(struct bnx2x_phy *phy,
 				      struct link_params *params)
 {
 	struct bnx2x *bp = params->bp;