ethernet: aeroflex: fix potential skb leak in greth_init_rings()

The greth_init_rings() function won't free the newly allocated skb when
dma_mapping_error() returns error, so add dev_kfree_skb() to fix it.

Compile tested only.

Fixes: d4c4113 ("net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver")
Signed-off-by: Zhang Changzhong <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: Zhang Changzhong

drivers/net/ethernet/aeroflex/greth.c

@@ -258,6 +258,7 @@ static int greth_init_rings(struct greth_private *greth)
 			if (dma_mapping_error(greth->dev, dma_addr)) {
 				if (netif_msg_ifup(greth))
 					dev_err(greth->dev, "Could not create initial DMA mapping\n");
+				dev_kfree_skb(skb);
 				goto cleanup;
 			}
 			greth->rx_skbuff[i] = skb;