ethernet/marvell: fix repeated words in comments

Delete the redundant word 'a'.
Signed-off-by: NJilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/sky2.c

@@ -4711,7 +4711,7 @@ static irqreturn_t sky2_test_intr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-/* Test interrupt path by forcing a a software IRQ */
+/* Test interrupt path by forcing a software IRQ */
 static int sky2_test_msi(struct sky2_hw *hw)
 {
 	struct pci_dev *pdev = hw->pdev;