tcp: Work around gcc 12 bogus warning in tcp_rtt_dst_check()

gcc 12.1.x (e.g. current OpenSUSE Tumbleweed, x86_64 only,
gcc-12-1.4.x86_64) reports:

tcp.c: In function ‘tcp_send_flag’:
tcp.c:1014:9: warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
 1014 |         memcpy(low_rtt_dst + hole++, &conn->a.a6, sizeof(conn->a.a6));
      |         ^
tcp.c:559:24: note: at offset -16 into destination object ‘low_rtt_dst’ of size 128
  559 | static struct in6_addr low_rtt_dst[LOW_RTT_TABLE_SIZE];
      |

but 'hole' can't be -1, because the low_rtt_dst table is guaranteed
to have a hole: if we happened to write to the last entry, we'll go
back to index 0 and clear that one.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions