[curl/curl] 5cf0ae: hostip: fix 3 coverity complaints

  Branch: refs/heads/bagder/localhost-nits
  Home:   https://github.com/curl/curl
  Commit: 5cf0ae3ba14ce0a3bf10267d07b6d0d61757776a
      https://github.com/curl/curl/commit/5cf0ae3ba14ce0a3bf10267d07b6d0d61757776a
  Author: Daniel Stenberg <[email protected]>
  Date:   2021-06-01 (Tue, 01 Jun 2021)

  Changed paths:
    M lib/hostip.c

  Log Message:
  -----------
  hostip: fix 3 coverity complaints

Follow-up to 1a0ebf6632f889eed

- Check the return code to Curl_inet_pton() in two instances, even
  though we know the input is valid so the functions won't fail.

- Clear the 'struct sockaddr_in' struct before use so that the
  'sin_zero' field isn't left uninitialized.

Detected by Coverity.


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