convert hd44780 driver to use bignum library, add a few security checks
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@@ -34,7 +34,7 @@ MODULE_EXPORT void HD44780_hbar (Driver *drvthis, int x, int y, int len, int pro
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MODULE_EXPORT void HD44780_num (Driver *drvthis, int x, int num);
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MODULE_EXPORT int HD44780_icon (Driver *drvthis, int x, int y, int icon);
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MODULE_EXPORT void HD44780_set_char (Driver *drvthis, int n, char *dat);
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MODULE_EXPORT void HD44780_set_char (Driver *drvthis, int n, unsigned char *dat);
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MODULE_EXPORT void HD44780_backlight (Driver *drvthis, int on);
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MODULE_EXPORT void HD44780_output (Driver *drvthis, int state);
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