make get_key() result const char *, so that it is not modified
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@@ -19,7 +19,7 @@ MODULE_EXPORT void MtxOrb_set_contrast (Driver *drvthis, int promille);
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MODULE_EXPORT void MtxOrb_backlight (Driver *drvthis, int on);
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MODULE_EXPORT void MtxOrb_output (Driver *drvthis, int on);
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MODULE_EXPORT char * MtxOrb_get_key (Driver *drvthis);
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MODULE_EXPORT const char * MtxOrb_get_key (Driver *drvthis);
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MODULE_EXPORT char * MtxOrb_get_info (Driver *drvthis);
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MODULE_EXPORT void MtxOrb_num (Driver *drvthis, int x, int num);
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