staging: wilc1000: Optimize code of wilc_get_chipid function

This patch optimize code of wilc_get_chipid function.
u8 type changed to boolean type and removed unnecessary if statement.

Signed-off-by: Chris Park <chris.park@atmel.com>
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>