qla3xxx: ethernet: Silence static checker warning.

Silence the following warning:
"warn: returning -1 instead of -ENOMEM is sloppy".
Signed-off-by: NSantosh Nayak <santoshprasadnayak@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qla3xxx.c

@@ -2836,7 +2836,7 @@ static int ql_create_send_free_list(struct ql3_adapter *qdev)
 		req_q_curr++;
 		tx_cb->oal = kmalloc(512, GFP_KERNEL);
 		if (tx_cb->oal == NULL)
-			return -1;
+			return -ENOMEM;
 	}
 	return 0;
 }