nextincr in krb5int_dns_init too small

Daniel Colascione dancol at
Thu Feb 18 07:46:39 EST 2016

krb5int_dns_init has a conventional malloc-and-realloc-until-it-fits
loop, but inside the loop body, we're calling res_nsearch, which can do
non-trivial work. It'd be better to increase the initial guess from 2048
to something bigger; even 4k is a trivial amount of memory these days,
and I'm getting 2786-byte responses.

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