net: marvell: prestera: fix typo in comment

Spelling mistake (triple letters) in comment.
Detected with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/prestera_rxtx.c

@@ -102,7 +102,7 @@ struct prestera_sdma {
 	struct net_device napi_dev;
 	u32 map_addr;
 	u64 dma_mask;
-	/* protect SDMA with concurrrent access from multiple CPUs */
+	/* protect SDMA with concurrent access from multiple CPUs */
 	spinlock_t tx_lock;
 };