celfmt: avoid truncating output file on -agent error - #110
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When -o is used and formatting fails, os.Create had already truncated the output file before the error was detected. Buffer the formatted output in memory and only create the output file on success. Also replace log.Fatal with log.Printf + return so the exit goes through Main rather than bypassing it.
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When -o is used and formatting fails, os.Create had already truncated the output file before the error was detected. Buffer the formatted output in memory and only create the output file on success.
Also replace log.Fatal with log.Printf + return so the exit goes through Main rather than bypassing it.