sntp never retries if server doesn't respond to NTP query

[jeffgros]

In function SNTP_run of sntp.c, the NTP query is only resent if ((ntp_retry_cnt % 0xFFF) == 0). However, as is, the code only increments ntp_retry_cnt when it is zero. This means that the NTP query is never sent more than once (retry mechanism isn't working).

A possible solution would be to move the ntp_retry_cnt increment above of the 'if((ntp_retry_cnt % 0xFFF) == 0)' block. When I tried this, the retry mechanism worked.