Staging: silicom: Fixed error 'space prohibited before that close parenthesis ')''

This patch fixes error 'space prohibited before that close parenthesis ')'' found by
checkpatch in driver silicom.

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