virtio-blk: remove duplicate definition of VirtIOBlock *s pointer

VirtIOBlock *s is already defined and initialized with req->dev
on top of virtio_blk_handle_request(), so we can remove it from
the code block of VIRTIO_BLK_T_GET_ID case.
Signed-off-by: NStefano Garzarella <sgarzare@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Message-Id: <20190130095231.42081-1-sgarzare@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

hw/block/virtio-blk.c

@@ -569,8 +569,6 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
         break;
     case VIRTIO_BLK_T_GET_ID:
     {
-        VirtIOBlock *s = req->dev;
-
         /*
          * NB: per existing s/n string convention the string is
          * terminated by '\0' only when shorter than buffer.