wl12xx: allocate buffer spi read/write command buffer kzalloc()

Needed for DMA safe transfers.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index f252a11..5865935 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -384,6 +384,7 @@
 	struct wl12xx_debugfs debugfs;
 
 	u32 buffer_32;
+	u32 buffer_cmd;
 };
 
 int wl12xx_plt_start(struct wl12xx *wl);