net: mvpp2: avoid checking for free aggregated descriptors twice

Avoid repeating the check for free aggregated descriptors when it
already failed at the beginning of the function.
Signed-off-by: Yan Markman <ymarkman@marvell.com>
[Antoine: commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -5487,11 +5487,10 @@ static int mvpp2_aggr_desc_num_check(struct mvpp2 *priv,
 					     MVPP2_AGGR_TXQ_STATUS_REG(cpu));
 
 		aggr_txq->count = val & MVPP2_AGGR_TXQ_PENDING_MASK;
-	}
-
-	if ((aggr_txq->count + num) > MVPP2_AGGR_TXQ_SIZE)
-		return -ENOMEM;
 
+		if ((aggr_txq->count + num) > MVPP2_AGGR_TXQ_SIZE)
+			return -ENOMEM;
+	}
 	return 0;
 }