ks8842: Fix ks8842_tx_frame() for 16bit case.

As reported by Andrew:

drivers/net/ks8842.c: In function 'ks8842_handle_rx':
drivers/net/ks8842.c:428: warning: 'status' may be used uninitialized in this function

Just use the 32-bit status for all reads, and delete the useless
cast to 'int' when reading a u16 into 'len'.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ks8842.c

@@ -424,16 +424,14 @@ static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
 static void ks8842_rx_frame(struct net_device *netdev,
 	struct ks8842_adapter *adapter)
 {
-	u16 status16;
 	u32 status;
 	int len;
 
 	if (adapter->conf_flags & KS884X_16BIT) {
-		status16 = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
-		len  = (int)ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
-		len &= 0xffff;
+		status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
+		len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
 		netdev_dbg(netdev, "%s - rx_data: status: %x\n",
-			   __func__, status16);
+			   __func__, status);
 	} else {
 		status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
 		len = (status >> 16) & 0x7ff;