Fix for platforms that assume a char is unsigned.
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@@ -1137,7 +1137,7 @@ unsigned char HD44780_scankeypad(PrivateData *p)
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unsigned int shiftingbit;
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unsigned int shiftingbit;
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unsigned int Ypattern;
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unsigned int Ypattern;
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unsigned int Yval;
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unsigned int Yval;
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char exp;
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signed char exp;
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unsigned char scancode = 0;
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unsigned char scancode = 0;
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