Fix buffer underrun in read_chk_line for empty line #4
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Also remove redundant condition. We do p = strchr(line, '\n') which looks for the *first* \n, so *(p -1) can never be '\n'
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Also remove redundant condition. We do p = strchr(line, '\n') which looks for the
first '\n', so *(p -1) can never be '\n'