net/cadence/macb: fix bug/typo in extracting gem_irq_read_clear bit

Signed-off-by: Jongsung Kim <neidhard.kim@lge.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index f7e21f2..e866608 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -1292,7 +1292,7 @@
 static void macb_configure_caps(struct macb *bp)
 {
 	if (macb_is_gem(bp)) {
-		if (GEM_BF(IRQCOR, gem_readl(bp, DCFG1)) == 0)
+		if (GEM_BFEXT(IRQCOR, gem_readl(bp, DCFG1)) == 0)
 			bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
 	}
 }