Loads joystick calibration data.


int load_joystick_data(const char *filename);
Restores calibration data previously stored by save_joystick_data() or the setup utility. This sets up all aspects of the joystick code: you don't even need to call install_joystick() if you are using this function. Pass a NULL filename to read the data from the currently selected configuration file.
Returns zero on success: if it fails the joystick state is undefined and you must reinitialise it from scratch.

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