evdev-touchpad: Twiddle finger_state correctly

The original code always set the finger_state to the appropriate bitmask
irrespective of whether the event was a press or a release. It would also blat
all members of the bitmask rather than ORing in the new bit for the event.

Cc:Jonas Ådahl <jadahl@gmail.com>
Signed-off-by: Rob Bradford <rob@linux.intel.com>

src/evdev-touchpad.c

@@ -457,19 +457,19 @@ process_key(struct touchpad_dispatch *touchpad,
 		touchpad->reset = 1;
 		break;
 	case BTN_TOOL_FINGER:
-		touchpad->finger_state =
-			~TOUCHPAD_FINGERS_ONE | e->value ?
-			TOUCHPAD_FINGERS_ONE : 0;
+		touchpad->finger_state &= ~TOUCHPAD_FINGERS_ONE;
+		if (e->value)
+			touchpad->finger_state |= TOUCHPAD_FINGERS_ONE;
 		break;
 	case BTN_TOOL_DOUBLETAP:
-		touchpad->finger_state =
-			~TOUCHPAD_FINGERS_TWO | e->value ?
-			TOUCHPAD_FINGERS_TWO : 0;
+		touchpad->finger_state &= ~TOUCHPAD_FINGERS_TWO;
+		if (e->value)
+			touchpad->finger_state |= TOUCHPAD_FINGERS_TWO;
 		break;
 	case BTN_TOOL_TRIPLETAP:
-		touchpad->finger_state =
-			~TOUCHPAD_FINGERS_THREE | e->value ?
-			TOUCHPAD_FINGERS_THREE : 0;
+		touchpad->finger_state &= ~TOUCHPAD_FINGERS_THREE;
+		if (e->value)
+			touchpad->finger_state |= TOUCHPAD_FINGERS_THREE;
 		break;
 	}
 }