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Resolving issue 250, divide-by-zero error when calibrating IMU https://github.com/m5stack/M5Stack/issues/250

Divide by zero error when FIFO is disabled for MPU9250, calibrateMPU9250 doesn't work.

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Following the code examples, if I run `IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);` to calibrate the bias, my program will crash with a divide-by-zero error. Upon further investigation, I found that `readBytes(MPU9250_ADDRESS, FIFO_COUNTH, 2,...