Input: ili210x - add missing negation for touch indication on ili210x

This adds the negation needed for proper finger detection on Ilitek
ili2107/ili210x. This fixes polling issues (on Amazon Kindle Fire)
caused by returning false for the cooresponding finger on the touchscreen.
Signed-off-by: Hansem Ro <hansemro@outlook.com>
Fixes: e3559442 ("ili210x - rework the touchscreen sample processing")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/ili210x.c

@@ -87,7 +87,7 @@ static bool ili210x_touchdata_to_coords(const u8 *touchdata,
 					unsigned int *x, unsigned int *y,
 					unsigned int *z)
 {
-	if (touchdata[0] & BIT(finger))
+	if (!(touchdata[0] & BIT(finger)))
 		return false;
 
 	*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);