rt2x00: convert rt2800_register_read return type

This is a semi-automated conversion to change rt2800_register_read
to return the register contents instead of passing them by value,
resulting in much better object code. The majority of the patch
was done using:

sed -i 's:\(rt2800_register_read(.*, .*\), &\(.*\));:\2 = \1);:' \
       's:\(rt2800_register_read_lock(.*, .*\), &\(.*\));:\2 = \1);:' \
	drivers/net/wireless/ralink/rt2x00/rt2800lib.c

The function itself was modified manually along with the one remaining
multi-line caller that was not covered automatically and the indirect
reference.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ralink/rt2x00/rt2800lib.h

@@ -78,30 +78,20 @@ struct rt2800_ops {
 	__le32 *(*drv_get_txwi)(struct queue_entry *entry);
 };
 
-static inline void rt2800_register_read(struct rt2x00_dev *rt2x00dev,
-					const unsigned int offset,
-					u32 *value)
+static inline u32 rt2800_register_read(struct rt2x00_dev *rt2x00dev,
+				       const unsigned int offset)
 {
 	const struct rt2800_ops *rt2800ops = rt2x00dev->ops->drv;
 
-	*value = rt2800ops->register_read(rt2x00dev, offset);
-}
-
-static inline void rt2800_register_read_lock(struct rt2x00_dev *rt2x00dev,
-					     const unsigned int offset,
-					     u32 *value)
-{
-	const struct rt2800_ops *rt2800ops = rt2x00dev->ops->drv;
-
-	*value = rt2800ops->register_read_lock(rt2x00dev, offset);
+	return rt2800ops->register_read(rt2x00dev, offset);
 }
 
-static inline u32 _rt2800_register_read(struct rt2x00_dev *rt2x00dev,
-					const unsigned int offset)
+static inline u32 rt2800_register_read_lock(struct rt2x00_dev *rt2x00dev,
+					    const unsigned int offset)
 {
 	const struct rt2800_ops *rt2800ops = rt2x00dev->ops->drv;
 
-	return rt2800ops->register_read(rt2x00dev, offset);
+	return rt2800ops->register_read_lock(rt2x00dev, offset);
 }
 
 static inline void rt2800_register_write(struct rt2x00_dev *rt2x00dev,