ath9k_hw: clean up register write buffering

Throughout the code, DISABLE_REGWRITE_BUFFER is always called right after
REGWRITE_BUFFER_FLUSH. Since that's unlikely to change any time soon, that
makes keeping those ops separate rather pointless, as it only increases
code size and line number counts.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index 5894fcc..cee0191 100644
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -102,14 +102,12 @@
  * @read: Register read
  * @write: Register write
  * @enable_write_buffer: Enable multiple register writes
- * @disable_write_buffer: Disable multiple register writes
- * @write_flush: Flush buffered register writes
+ * @write_flush: flush buffered register writes and disable buffering
  */
 struct ath_ops {
 	unsigned int (*read)(void *, u32 reg_offset);
 	void (*write)(void *, u32 val, u32 reg_offset);
 	void (*enable_write_buffer)(void *);
-	void (*disable_write_buffer)(void *);
 	void (*write_flush) (void *);
 };