drivers: w1: removed assignment from within if statement

Assignment of variable count removed from within an if statment.
This was done at two locations in the file.

Signed-off-by: Ben Werbowyj <ben.werbowyj@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>