w1: ds2490 reduce magic numbers
w1: ds2490 reduce magic numbers

Use a #define for the usb vendor request type, clear the status
byte and use that instead of a magic offset in checking if idle.

Signed-off-by: David Fries <d27937f914ebe99ee315f04449678eccfb658191@Fries.net>
Acked-by: Evgeniy Polyakov <9be07b15919dab1b45f07f962d8e37ba7c50f920@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs