Endianess bug fix for sierra_net

I discovered I couldn't get sierra_net to work on a powerpc.  Turns out
the firmware attribute check assumes the system is little endian and
hence fails because the attributes is a 16 bit value.

Signed-off-by: Len Sorensen <redacted>

diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c
index 7be49ea..8e22417 100644
--- a/drivers/net/usb/sierra_net.c
+++ b/drivers/net/usb/sierra_net.c

@@ -656,7 +656,7 @@ static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
 		return -EIO;
 	}
 
-	*datap = *attrdata;
+	*datap = le16_to_cpu(*attrdata);
 
 	kfree(attrdata);
 	return result;