rt2x00: Cleanup chip handling helper functions.

Let each of them take a struct rt2x00_dev pointer as argument instead of
a mixture of struct rt2x00_chip and struct rt2x00_dev pointers.
Preparation for further clean ups in the rt2x00 chip handling, especially
for rt2800 devices.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 40295b4..411655e 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -92,7 +92,7 @@
 static int rt2800usb_check_firmware(struct rt2x00_dev *rt2x00dev,
 				    const u8 *data, const size_t len)
 {
-	u16 chipset = (rt2x00_rev(&rt2x00dev->chip) >> 16) & 0xffff;
+	u16 chipset = (rt2x00_rev(rt2x00dev) >> 16) & 0xffff;
 	size_t offset = 0;
 
 	/*
@@ -138,7 +138,7 @@
 	u32 reg;
 	u32 offset;
 	u32 length;
-	u16 chipset = (rt2x00_rev(&rt2x00dev->chip) >> 16) & 0xffff;
+	u16 chipset = (rt2x00_rev(rt2x00dev) >> 16) & 0xffff;
 
 	/*
 	 * Check which section of the firmware we need.