replication: Fix replication open fail

replication_child_perm request write
permissions for all child which will lead bdrv_check_perm fail.
replication_child_perm() should request write
permissions only if it is writable itself.

Signed-off-by: Wang Guang <wang.guang55@zte.com.cn>
Signed-off-by: Wang Yong <wang.yong155@zte.com.cn>
Reviewed-by: Xie Changlong <xiechanglong@cmss.chinamobile.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed