Staging: silicom : Fixed error 'exactly one space required after that #ifdef'

This patch fixes error 'exactly one space required after that #ifdef' found by
checkpatch in driver silicom.

Signed-off-by: Tülin İzer <tulinizer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>