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If there are 0 or 1 valid record in xentrace file, SIGFPE will occur. Fix it. Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com>
If there are 0 or 1 valid record in xentrace file, SIGFPE will occur. Fix it. Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com>