timeout_count is never reset once a tftpput transfer has started. If for
whatever reason timeouts occur frequently, but the server keeps replying
nonetheless, the transfer may be needlessly aborted.
Reset timer_count on reception of an ACK to avoid this situation.
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
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