Fixes the following sparse warning:
drivers/net/dsa/bcm_sf2.c:963:19: warning:
 symbol 'bcm_sf2_io_ops' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
        return 0;
 }
 
-struct b53_io_ops bcm_sf2_io_ops = {
+static struct b53_io_ops bcm_sf2_io_ops = {
        .read8  = bcm_sf2_core_read8,
        .read16 = bcm_sf2_core_read16,
        .read32 = bcm_sf2_core_read32,