staging: wilc1000: linux_mon: remove space after a cast

This patch removes space after a type cast found by checkpatch.pl
CHECK: No space is necessary after a cast

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>