TDISP demo fix

demos/modules/tdisp/main.c

@@ -30,7 +30,7 @@
 #include "gfx.h"
 
 int main(void) {
-	char charmap[8];
+	uint8_t charmap[8];
 
 	halInit();
 	chSysInit();

include/tdisp/tdisp.h

@@ -108,7 +108,7 @@ void tdispSetCursor(coord_t col, coord_t row);
  * 							made up of @p tdispGetCharBitWidth() bits of data. Note that bits in multiple rows are not
  * 							packed.
  */
-void tdispCreateChar(uint8_t address, uint8_t *charmap);
+void tdispCreateChar(uint8_t address, char* charmap);
 
 /**
  * @brief	Draws a single character at the current cursor position and advances the cursor