Input: alps - process_bitmap: fix counting of high point bits

alps_process_bitmap was resetting the point bit-count as soon as it saw
2 0 bits in a row. This means that unless the high point actually is at
the end of the bitmap, it would always get its num_bits set to 0.

Instead reset num_bits to 0 on a 0->1 transition, so that with > 2 fingers
we only count the number of bits occupied by the highest finger.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/alps.c

@@ -342,14 +342,13 @@ static void alps_get_bitmap_points(unsigned int map,
 		if (bit) {
 			if (!prev_bit) {
 				point->start_bit = i;
+				point->num_bits = 0;
 				(*fingers)++;
 			}
 			point->num_bits++;
 		} else {
 			if (prev_bit)
 				point = high;
-			else
-				point->num_bits = 0;
 		}
 		prev_bit = bit;
 	}