rt2800usb: add rt2800_regbusy_read() wrapper

Part of preparations for later code unification.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.h b/drivers/net/wireless/rt2x00/rt2800usb.h
index 95a4f96..180dfce 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.h
+++ b/drivers/net/wireless/rt2x00/rt2800usb.h
@@ -62,6 +62,14 @@
 	rt2x00usb_register_multiwrite(rt2x00dev, offset, value, length);
 }
 
+static inline int rt2800_regbusy_read(struct rt2x00_dev *rt2x00dev,
+				      const unsigned int offset,
+				      struct rt2x00_field32 field,
+				      u32 *reg)
+{
+	return rt2x00usb_regbusy_read(rt2x00dev, offset, field, reg);
+}
+
 /*
  * RF chip defines.
  *