make get_key() result const char *, so that it is not modified
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@@ -46,7 +46,7 @@ MODULE_EXPORT void ms6931_backlight (Driver *drvthis, int on);
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MODULE_EXPORT void ms6931_chr (Driver *drvthis, int x, int y, char c);
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MODULE_EXPORT void ms6931_clear (Driver *drvthis);
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MODULE_EXPORT void ms6931_string (Driver *drvthis, int x, int y, char string[]);
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MODULE_EXPORT char ms6931_get_key (Driver *drvthis);
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MODULE_EXPORT const char *ms6931_get_key (Driver *drvthis);
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MODULE_EXPORT void ms6931_hbar (Driver *drvthis, int x, int y, int len, int promille, int pattern);
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MODULE_EXPORT void ms6931_heartbeat (Driver *drvthis, int state);
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