check_curl: fix checking large bodys (#1823)

check_curl fails on large pages:

  HTTP CRITICAL - Invalid HTTP response received from host on port 5080: cURL returned 23 - Failure writing output to destination

for example trying to run check_curl on the test from #1822

I guess the idea is to double the buffer size each time it is to small. But the code
exponentially grows the buffer size which works well 2-3 times, but then fails.

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