Get rid of Werror=maybe-uninitialized in res_send.c.
The commit 446997ff 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 d1bc2cbb.
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