make get_key() result const char *, so that it is not modified
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@@ -27,7 +27,7 @@ MODULE_EXPORT void bayrad_set_char(Driver * drvthis, int n, char *dat);
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MODULE_EXPORT void bayrad_backlight(Driver * drvthis, int promille);
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MODULE_EXPORT char *bayrad_get_key(Driver * drvthis);
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MODULE_EXPORT const char *bayrad_get_key(Driver * drvthis);
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MODULE_EXPORT void bayrad_init_vbar(Driver * drvthis);
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MODULE_EXPORT void bayrad_init_hbar(Driver * drvthis);
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