Fix invalid "Network is unreachable" errors #794
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Sometimes, in systems with both ipv4 and ipv6 addresses but where the
network doesn't support ipv6, Curl_is_connected returns an error
(intermittently) even if the ipv4 socket connects successfully.
This happens because there's a for-loop that iterates on the sockets
but the error variable is not resetted when the ipv4 is checked and
is ok.
This patch fixes this problem by setting error to 0 when checking the
second socket and not having a result yet.