hw/9pfs : add spaces around operator
Fix code style. Operator needs spaces both sides. Signed-off-by: Xinhao Zhang <zhangxinhao1@huawei.com> Signed-off-by: Kai Deng <dengkai1@huawei.com> Reported-by: Euler Robot <euler.robot@huawei.com> Reviewed-by: Greg Kurz <groug@kaod.org> Message-Id: <20201030043515.1030223-1-zhangxinhao1@huawei.com> Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
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