-Werror=array-bounds

[raymondjclark]

Encountering 6 errors while attempting to compile.

til/dns.c:6528:17: error: array subscript -2 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
so->query->data[-2] = 0xff & (so->query->end >> 8);

util/dns.c:6529:17: error: array subscript -1 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
so->query->data[-1] = 0xff & (so->query->end >> 0);
~~~~~~~~~~~~~~~^~~~
util/dns.c:6531:9: error: array subscript -2 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
qsrc = &so->query->data[-2] + so->qout;
       ^~~~~~~~~~~~~~~~~~~~
util/dns.c:6557:10: error: array subscript -2 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
 asrc = &so->answer->data[-2];
        ^~~~~~~~~~~~~~~~~~~~~
util/dns.c:6568:18: error: array subscript -2 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
  alen = ((0xff & so->answer->data[-2]) << 8)
          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
util/dns.c:6569:42: error: array subscript -1 is below array bounds of 'unsigned char[1]' [-Werror=array-bounds]
       | ((0xff & so->answer->data[-1]) << 0);
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~