net/eth: Clean up local variable shadowing

Fix:

  net/eth.c:435:20: error: declaration shadows a local variable [-Werror,-Wshadow]
            size_t input_size = iov_size(pkt, pkt_frags);
                   ^
  net/eth.c:413:16: note: previous declaration is here
        size_t input_size = iov_size(pkt, pkt_frags);
               ^

Suggested-by: Akihiko Odaki <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Message-ID: <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Reviewed-by: Akihiko Odaki <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>

net/eth.c

@@ -432,8 +432,6 @@ _eth_get_rss_ex_src_addr(const struct iovec *pkt, int pkt_frags,
         }
 
         if (opthdr.type == IP6_OPT_HOME) {
-            size_t input_size = iov_size(pkt, pkt_frags);
-
             if (input_size < opt_offset + sizeof(opthdr)) {
                 return false;
             }