[PATCH] dsa: tag_brcm: Fix build error without CONFIG_NET_DSA_TAG_BRCM_PREPEND

[YueHaibing]

Fix gcc build error:

net/dsa/tag_brcm.c:211:16: error: brcm_prepend_netdev_ops undeclared here (not in a function); did you mean brcm_netdev_ops?
 DSA_TAG_DRIVER(brcm_prepend_netdev_ops);
                ^
./include/net/dsa.h:708:10: note: in definition of macro DSA_TAG_DRIVER
  .ops = &__ops,       \
          ^~~~~
./include/net/dsa.h:701:36: warning: dsa_tag_driver_brcm_prepend_netdev_ops defined but not used [-Wunused-variable]
 #define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
                                    ^
./include/net/dsa.h:707:30: note: in expansion of macro DSA_TAG_DRIVER_NAME
 static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = {  \
                              ^~~~~~~~~~~~~~~~~~~
net/dsa/tag_brcm.c:211:1: note: in expansion of macro DSA_TAG_DRIVER
 DSA_TAG_DRIVER(brcm_prepend_netdev_ops);

Like the CONFIG_NET_DSA_TAG_BRCM case,
brcm_prepend_netdev_ops and DSA_TAG_PROTO_BRCM_PREPEND
should be wrappeed by CONFIG_NET_DSA_TAG_BRCM_PREPEND.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: b74b70c44986 ("net: dsa: Support prepended Broadcom tag")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/dsa/tag_brcm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index d52db5f..9c31141 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -206,10 +206,10 @@ static const struct dsa_device_ops brcm_prepend_netdev_ops = {
 	.rcv	= brcm_tag_rcv_prepend,
 	.overhead = BRCM_TAG_LEN,
 };
-#endif
 
 DSA_TAG_DRIVER(brcm_prepend_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_PREPEND);
+#endif
 
 static struct dsa_tag_driver *dsa_tag_driver_array[] =	{
 #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM)
-- 
2.7.4