linux-phytec-ti

net: ti: prueth: Fix compile warning from switch code

Fix the following compile warning:

drivers/net/ethernet/ti/prueth.c: In function ‘prueth_sw_insert_fdb_entry’:
drivers/net/ethernet/ti/prueth.c:2365:30: warning: unused variable ‘mt’ [-Wunused-variable]
  struct fdb_mac_tbl_array_t *mt = fdb->mac_tbl_a;
                              ^~
Signed-off-by: WingMan Kwok <w-kwok2@ti.com>