LSM303: Fixed a problem in readMag introduced in a recent commit.
LSM303: Fixed a problem in readMag introduced in a recent commit.

quattrinili/minimu9-ahrs,quattrinili/minimu9-ahrs,zhahaoyu/minimu9-ahrs,zhahaoyu/minimu9-ahrs,quattrinili/minimu9-ahrs,zhahaoyu/minimu9-ahrs,quattrinili/minimu9-ahrs,zhahaoyu/minimu9-ahrs