sync: fix memleak if realloc() unverified failed (OOM) - #286
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realloc() always need check on valid ptr maybe out of memory References: - https://stackoverflow.com/questions/21006707/proper-usage-of-realloc - https://stackoverflow.com/questions/1986538/how-to-handle-realloc-when-it-fails-due-to-memory
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realloc() always need check on valid ptr maybe out of memory
References: