[PATCH] Get rid of Werror=maybe-uninitialized in res_send.c.

[Stefan Liebler]

Hi,

the commit 446997ff1433d33452b81dfa9e626b8dccf101a4 introduced
this new usage of resplen. If build with gcc 9 -march>=z13 on s390x,
the following warning occurs:
res_send.c: In function ‘__res_context_send’:
res_send.c:539:6: error: ‘resplen’ may be used uninitialized in this 
function [-Werror=maybe-uninitialized]
539 |   if (resplen > HFIXEDSZ)
|      ^

Therefore this patch adds a further DIAG_IGNORE_NEEDS_COMMENT in the
same way as it was previously done for usages of resplen or n.
See commit d1bc2cbbed9aea2017ef941f63c8786571da5b4f.

Bye
Stefan
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