bnx2: Check BNX2_FLAG_USING_MSIX flag when setting up MSIX.

Checking the flag is more correct than checking bp->irq_nvecs. By
accident it is not a problem because we always have more than 1
vectors when using MSIX mode.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -4940,7 +4940,7 @@ bnx2_init_chip(struct bnx2 *bp)
 		      BNX2_HC_CONFIG_COLLECT_STATS;
 	}
 
-	if (bp->irq_nvecs > 1) {
+	if (bp->flags & BNX2_FLAG_USING_MSIX) {
 		REG_WR(bp, BNX2_HC_MSIX_BIT_VECTOR,
 		       BNX2_HC_MSIX_BIT_VECTOR_VAL);