Compiling DPDK with -Wshadow causes additional warnings about potential issues
caused by duplicate shadow declarations. One driver with issues is net/zxdh.

[1528/3627] Compiling C object
drivers/libtmp_rte_net_zxdh.a.p/net_zxdh_zxdh_msg.c.o
In file included from ../drivers/net/zxdh/zxdh_msg.h:14,
                 from ../drivers/net/zxdh/zxdh_msg.c:17:
../drivers/net/zxdh/zxdh_msg.c: In function ‘zxdh_add_vf_mac_table’:
../drivers/net/zxdh/zxdh_common.h:94:18: warning: declaration of ‘addr’ shadows
a previous local [-Wshadow]
   94 |         uint8_t *addr = ZXDH_ADDR_OF(typ, p, fld); \
      |                  ^~~~
../drivers/net/zxdh/zxdh_msg.c:1441:17: note: in expansion of macro ‘ZXDH_SET’
 1441 |                 ZXDH_SET(mac_reply_msg, mac_reply_msg_addr, mac_flag,
ZXDH_EEXIST_MAC_FLAG);
      |                 ^~~~~~~~
../drivers/net/zxdh/zxdh_msg.c:1428:32: note: shadowed declaration is here
 1428 |         struct rte_ether_addr *addr = &mac_filter->mac;
      |                                ^~~~
../drivers/net/zxdh/zxdh_common.h:94:18: warning: declaration of ‘addr’ shadows
a previous local [-Wshadow]
   94 |         uint8_t *addr = ZXDH_ADDR_OF(typ, p, fld); \
      |                  ^~~~
../drivers/net/zxdh/zxdh_msg.c:1462:9: note: in expansion of macro ‘ZXDH_SET’
 1462 |         ZXDH_SET(msg_reply_body, reply_body, flag, ZXDH_REPS_SUCC);
      |         ^~~~~~~~
../drivers/net/zxdh/zxdh_msg.c:1428:32: note: shadowed declaration is here
 1428 |         struct rte_ether_addr *addr = &mac_filter->mac;
      |                                ^~~~
../drivers/net/zxdh/zxdh_common.h:94:18: warning: declaration of ‘addr’ shadows
a previous local [-Wshadow]
   94 |         uint8_t *addr = ZXDH_ADDR_OF(typ, p, fld); \
      |                  ^~~~
../drivers/net/zxdh/zxdh_msg.c:1468:9: note: in expansion of macro ‘ZXDH_SET’
 1468 |         ZXDH_SET(msg_reply_body, reply_body, flag, ZXDH_REPS_FAIL);
      |         ^~~~~~~~
../drivers/net/zxdh/zxdh_msg.c:1428:32: note: shadowed declaration is here
 1428 |         struct rte_ether_addr *addr =