bna: add missing iounmap() on error in bnad_init()

Add the missing iounmap() before return from bnad_init()
in the error handling case.
Introduced by commit 01b54b1451853593739816a392485c4e2bee7dda
(bna: tx rx cleanup fix).

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bnad.c

@@ -3236,9 +3236,10 @@ bnad_init(struct bnad *bnad,
 
 	sprintf(bnad->wq_name, "%s_wq_%d", BNAD_NAME, bnad->id);
 	bnad->work_q = create_singlethread_workqueue(bnad->wq_name);
-
-	if (!bnad->work_q)
+	if (!bnad->work_q) {
+		iounmap(bnad->bar0);
 		return -ENOMEM;
+	}
 
 	return 0;
 }