drivers: net: xgene: uninitialized variable in xgene_enet_free_pagepool()

We never set "slots" in this function.

Fixes: a9380b0f ("drivers: net: xgene: Add support for Jumbo frame")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NIyappan Subramanian <isubramanian@apm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/apm/xgene/xgene_enet_main.c

@@ -635,6 +635,7 @@ static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool,
 		return;
 
 	dev = ndev_to_dev(buf_pool->ndev);
+	slots = buf_pool->slots - 1;
 	head = buf_pool->head;
 
 	for (i = 0; i < 4; i++) {