misc: apds9802als: Fix the logic checking timeout in als_wait_for_data_ready()

In the case of timeout waiting for data ready, the retry variable is -1.
This also fixes a bug: current code returns -ETIMEDOUT if latest retry success
( which means retry is 0 when exiting the while loop ).

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/apds9802als.c

@@ -68,7 +68,7 @@ static int als_wait_for_data_ready(struct device *dev)
 		ret = i2c_smbus_read_byte_data(client, 0x86);
 	} while (!(ret & 0x80) && retry--);
 
-	if (!retry) {
+	if (retry < 0) {
 		dev_warn(dev, "timeout waiting for data ready\n");
 		return -ETIMEDOUT;
 	}