WAN: dscc4: Fix warning pointing out a bug.

Noticed by Stephen Rothwell:

	Today's linux-next build (x86_64 allmodconfig gcc-4.4.0)
	produced this warning:

	drivers/net/wan/dscc4.c: In function 'dscc4_rx_skb':
	drivers/net/wan/dscc4.c:670: warning: suggest parentheses around comparison in operand of '|'

	which actually points out a bug, I think.  It is doing
		(x & (y | z)) != y | z
	when it probably means
		(x & (y | z)) != (y | z)

	Introduced by commit 5de3fcab
	("WAN: bit and/or confusion").
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/dscc4.c

@@ -667,7 +667,7 @@ static inline void dscc4_rx_skb(struct dscc4_dev_priv *dpriv,
 		else if (!(skb->data[pkt_len] & FrameCrc))
 			dev->stats.rx_crc_errors++;
 		else if ((skb->data[pkt_len] & (FrameVfr | FrameRab)) !=
-				FrameVfr | FrameRab)
+			 (FrameVfr | FrameRab))
 			dev->stats.rx_length_errors++;
 		dev->stats.rx_errors++;
 		dev_kfree_skb_irq(skb);